STATE STREET GLOBAL ADVISORS TRUST COMPANY has sponsored the creation of one or more 401k plans.
Submission information for form 5500 for 401k plan STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I
401k plan membership statisitcs for STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I
| Measure | Date | Value |
|---|
| 2023 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2023 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2023-12-31 | $353,985,366 |
| Total unrealized appreciation/depreciation of assets | 2023-12-31 | $353,985,366 |
| Total transfer of assets to this plan | 2023-12-31 | $3,628,300,259 |
| Total transfer of assets from this plan | 2023-12-31 | $1,235,934,567 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2023-12-31 | $931,910,324 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2023-12-31 | $774,612,738 |
| Total income from all sources (including contributions) | 2023-12-31 | $628,700,582 |
| Total loss/gain on sale of assets | 2023-12-31 | $-109,099,020 |
| Total of all expenses incurred | 2023-12-31 | $1,095,433 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2023-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2023-12-31 | $0 |
| Value of total assets at end of year | 2023-12-31 | $13,812,181,575 |
| Value of total assets at beginning of year | 2023-12-31 | $10,634,913,148 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2023-12-31 | $1,095,433 |
| Total interest from all sources | 2023-12-31 | $383,814,236 |
| Total dividends received (eg from common stock, registered investment company shares) | 2023-12-31 | $0 |
| Assets. Other investments not covered elsewhere at end of year | 2023-12-31 | $254,735,429 |
| Assets. Other investments not covered elsewhere at beginning of year | 2023-12-31 | $237,190,406 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2023-12-31 | $463,113,538 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2023-12-31 | $278,749,554 |
| Assets. Loans (other than to participants) at end of year | 2023-12-31 | $204,357,727 |
| Assets. Loans (other than to participants) at beginning of year | 2023-12-31 | $177,703,656 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2023-12-31 | $931,910,324 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2023-12-31 | $774,612,738 |
| Administrative expenses (other) incurred | 2023-12-31 | $-80,044 |
| Total non interest bearing cash at end of year | 2023-12-31 | $83,757 |
| Total non interest bearing cash at beginning of year | 2023-12-31 | $14,406 |
| Value of net income/loss | 2023-12-31 | $627,605,149 |
| Value of net assets at end of year (total assets less liabilities) | 2023-12-31 | $12,880,271,251 |
| Value of net assets at beginning of year (total assets less liabilities) | 2023-12-31 | $9,860,300,410 |
| Income. Interest from loans (other than to participants) | 2023-12-31 | $4,010,343 |
| Interest earned on other investments | 2023-12-31 | $10,488,006 |
| Income. Interest from US Government securities | 2023-12-31 | $233,892,672 |
| Income. Interest from corporate debt instruments | 2023-12-31 | $124,531,752 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2023-12-31 | $697,498,981 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2023-12-31 | $632,748,734 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2023-12-31 | $632,748,734 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2023-12-31 | $10,891,463 |
| Asset value of US Government securities at end of year | 2023-12-31 | $8,800,365,504 |
| Asset value of US Government securities at beginning of year | 2023-12-31 | $6,817,429,116 |
| Asset. Corporate debt instrument preferred debt at end of year | 2023-12-31 | $2,033,421,560 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2023-12-31 | $0 |
| Asset. Corporate debt instrument debt (other) at end of year | 2023-12-31 | $1,358,605,079 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2023-12-31 | $2,491,077,276 |
| Contract administrator fees | 2023-12-31 | $1,157,093 |
| Aggregate proceeds on sale of assets | 2023-12-31 | $5,893,695,148 |
| Aggregate carrying amount (costs) on sale of assets | 2023-12-31 | $6,002,794,168 |
| 2022 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2022 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2022-12-31 | $-1,579,400,203 |
| Total unrealized appreciation/depreciation of assets | 2022-12-31 | $-1,579,400,203 |
| Total transfer of assets to this plan | 2022-12-31 | $3,282,657,772 |
| Total transfer of assets from this plan | 2022-12-31 | $1,934,179,407 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-12-31 | $774,612,738 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-12-31 | $656,588,313 |
| Total income from all sources (including contributions) | 2022-12-31 | $-1,369,822,565 |
| Total loss/gain on sale of assets | 2022-12-31 | $-26,727,449 |
| Total of all expenses incurred | 2022-12-31 | $1,405,209 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2022-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2022-12-31 | $0 |
| Value of total assets at end of year | 2022-12-31 | $10,634,913,148 |
| Value of total assets at beginning of year | 2022-12-31 | $10,539,638,132 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2022-12-31 | $1,405,209 |
| Total interest from all sources | 2022-12-31 | $236,305,087 |
| Total dividends received (eg from common stock, registered investment company shares) | 2022-12-31 | $0 |
| Administrative expenses professional fees incurred | 2022-12-31 | $8,818 |
| Assets. Other investments not covered elsewhere at end of year | 2022-12-31 | $237,190,406 |
| Assets. Other investments not covered elsewhere at beginning of year | 2022-12-31 | $214,701,892 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2022-12-31 | $278,749,554 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2022-12-31 | $265,459,165 |
| Assets. Loans (other than to participants) at end of year | 2022-12-31 | $177,703,656 |
| Assets. Loans (other than to participants) at beginning of year | 2022-12-31 | $193,011,827 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2022-12-31 | $774,612,738 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2022-12-31 | $656,588,313 |
| Administrative expenses (other) incurred | 2022-12-31 | $950,034 |
| Total non interest bearing cash at end of year | 2022-12-31 | $14,406 |
| Total non interest bearing cash at beginning of year | 2022-12-31 | $0 |
| Value of net income/loss | 2022-12-31 | $-1,371,227,774 |
| Value of net assets at end of year (total assets less liabilities) | 2022-12-31 | $9,860,300,410 |
| Value of net assets at beginning of year (total assets less liabilities) | 2022-12-31 | $9,883,049,819 |
| Investment advisory and management fees | 2022-12-31 | $446,357 |
| Income. Interest from loans (other than to participants) | 2022-12-31 | $-7,346,755 |
| Interest earned on other investments | 2022-12-31 | $7,875,330 |
| Income. Interest from US Government securities | 2022-12-31 | $144,950,495 |
| Income. Interest from corporate debt instruments | 2022-12-31 | $87,159,636 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2022-12-31 | $632,748,734 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2022-12-31 | $449,678,206 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2022-12-31 | $449,678,206 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2022-12-31 | $3,666,381 |
| Asset value of US Government securities at end of year | 2022-12-31 | $6,817,429,116 |
| Asset value of US Government securities at beginning of year | 2022-12-31 | $6,721,026,336 |
| Asset. Corporate debt instrument preferred debt at end of year | 2022-12-31 | $0 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2022-12-31 | $1,421,282,223 |
| Asset. Corporate debt instrument debt (other) at end of year | 2022-12-31 | $2,491,077,276 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2022-12-31 | $1,274,478,483 |
| Aggregate proceeds on sale of assets | 2022-12-31 | $6,646,926,778 |
| Aggregate carrying amount (costs) on sale of assets | 2022-12-31 | $6,673,654,227 |
| 2021 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2021 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2021-12-31 | $-193,972,365 |
| Total unrealized appreciation/depreciation of assets | 2021-12-31 | $-193,972,365 |
| Total transfer of assets to this plan | 2021-12-31 | $4,065,464,893 |
| Total transfer of assets from this plan | 2021-12-31 | $1,312,215,041 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2021-12-31 | $656,588,313 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2021-12-31 | $1,149,031,027 |
| Total income from all sources (including contributions) | 2021-12-31 | $-109,989,247 |
| Total loss/gain on sale of assets | 2021-12-31 | $-59,539,492 |
| Total of all expenses incurred | 2021-12-31 | $1,312,923 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2021-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2021-12-31 | $0 |
| Value of total assets at end of year | 2021-12-31 | $10,539,638,132 |
| Value of total assets at beginning of year | 2021-12-31 | $8,390,133,164 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2021-12-31 | $1,312,923 |
| Total interest from all sources | 2021-12-31 | $143,522,610 |
| Total dividends received (eg from common stock, registered investment company shares) | 2021-12-31 | $0 |
| Administrative expenses professional fees incurred | 2021-12-31 | $14,772 |
| Assets. Other investments not covered elsewhere at end of year | 2021-12-31 | $214,701,892 |
| Assets. Other investments not covered elsewhere at beginning of year | 2021-12-31 | $168,627,091 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2021-12-31 | $265,459,165 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2021-12-31 | $264,818,936 |
| Assets. Loans (other than to participants) at end of year | 2021-12-31 | $193,011,827 |
| Assets. Loans (other than to participants) at beginning of year | 2021-12-31 | $154,634,626 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2021-12-31 | $656,588,313 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2021-12-31 | $1,149,031,027 |
| Administrative expenses (other) incurred | 2021-12-31 | $1,298,151 |
| Total non interest bearing cash at end of year | 2021-12-31 | $0 |
| Total non interest bearing cash at beginning of year | 2021-12-31 | $33,871 |
| Value of net income/loss | 2021-12-31 | $-111,302,170 |
| Value of net assets at end of year (total assets less liabilities) | 2021-12-31 | $9,883,049,819 |
| Value of net assets at beginning of year (total assets less liabilities) | 2021-12-31 | $7,241,102,137 |
| Interest earned on other investments | 2021-12-31 | $5,555,112 |
| Income. Interest from US Government securities | 2021-12-31 | $82,082,580 |
| Income. Interest from corporate debt instruments | 2021-12-31 | $55,325,839 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2021-12-31 | $449,678,206 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2021-12-31 | $996,687,431 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2021-12-31 | $996,687,431 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2021-12-31 | $559,079 |
| Asset value of US Government securities at end of year | 2021-12-31 | $6,721,026,336 |
| Asset value of US Government securities at beginning of year | 2021-12-31 | $4,697,627,061 |
| Asset. Corporate debt instrument preferred debt at end of year | 2021-12-31 | $1,421,282,223 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2021-12-31 | $1,098,751,263 |
| Asset. Corporate debt instrument debt (other) at end of year | 2021-12-31 | $1,274,478,483 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2021-12-31 | $1,008,952,885 |
| Aggregate proceeds on sale of assets | 2021-12-31 | $8,463,135,615 |
| Aggregate carrying amount (costs) on sale of assets | 2021-12-31 | $8,522,675,107 |
| 2020 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2020 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2020-12-31 | $279,522,719 |
| Total unrealized appreciation/depreciation of assets | 2020-12-31 | $279,522,719 |
| Total transfer of assets to this plan | 2020-12-31 | $2,976,166,843 |
| Total transfer of assets from this plan | 2020-12-31 | $1,399,001,583 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2020-12-31 | $1,149,031,027 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2020-12-31 | $726,723,417 |
| Total income from all sources (including contributions) | 2020-12-31 | $396,603,409 |
| Total loss/gain on sale of assets | 2020-12-31 | $-11,023,700 |
| Total of all expenses incurred | 2020-12-31 | $457,122 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2020-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2020-12-31 | $0 |
| Value of total assets at end of year | 2020-12-31 | $8,390,133,164 |
| Value of total assets at beginning of year | 2020-12-31 | $5,994,514,007 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2020-12-31 | $457,122 |
| Total interest from all sources | 2020-12-31 | $128,104,390 |
| Total dividends received (eg from common stock, registered investment company shares) | 2020-12-31 | $0 |
| Administrative expenses professional fees incurred | 2020-12-31 | $14,330 |
| Assets. Other investments not covered elsewhere at end of year | 2020-12-31 | $168,627,091 |
| Assets. Other investments not covered elsewhere at beginning of year | 2020-12-31 | $114,580,075 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2020-12-31 | $264,818,936 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2020-12-31 | $187,507,320 |
| Assets. Loans (other than to participants) at end of year | 2020-12-31 | $154,634,626 |
| Assets. Loans (other than to participants) at beginning of year | 2020-12-31 | $106,615,762 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2020-12-31 | $1,149,031,027 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2020-12-31 | $726,723,417 |
| Administrative expenses (other) incurred | 2020-12-31 | $442,792 |
| Total non interest bearing cash at end of year | 2020-12-31 | $33,871 |
| Total non interest bearing cash at beginning of year | 2020-12-31 | $10,857 |
| Value of net income/loss | 2020-12-31 | $396,146,287 |
| Value of net assets at end of year (total assets less liabilities) | 2020-12-31 | $7,241,102,137 |
| Value of net assets at beginning of year (total assets less liabilities) | 2020-12-31 | $5,267,790,590 |
| Income. Interest from loans (other than to participants) | 2020-12-31 | $2,478,969 |
| Interest earned on other investments | 2020-12-31 | $5,418,890 |
| Income. Interest from US Government securities | 2020-12-31 | $83,693,892 |
| Income. Interest from corporate debt instruments | 2020-12-31 | $35,299,238 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2020-12-31 | $996,687,431 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2020-12-31 | $581,781,044 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2020-12-31 | $581,781,044 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2020-12-31 | $1,213,401 |
| Asset value of US Government securities at end of year | 2020-12-31 | $4,697,627,061 |
| Asset value of US Government securities at beginning of year | 2020-12-31 | $3,544,964,251 |
| Asset. Corporate debt instrument preferred debt at end of year | 2020-12-31 | $1,098,751,263 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2020-12-31 | $761,207,940 |
| Asset. Corporate debt instrument debt (other) at end of year | 2020-12-31 | $1,008,952,885 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2020-12-31 | $697,846,758 |
| Aggregate proceeds on sale of assets | 2020-12-31 | $5,781,248,385 |
| Aggregate carrying amount (costs) on sale of assets | 2020-12-31 | $5,792,272,085 |
| 2019 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2019 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2019-12-31 | $259,770,164 |
| Total unrealized appreciation/depreciation of assets | 2019-12-31 | $259,770,164 |
| Total transfer of assets to this plan | 2019-12-31 | $1,741,383,632 |
| Total transfer of assets from this plan | 2019-12-31 | $1,129,989,906 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $726,723,417 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $554,222,522 |
| Total income from all sources (including contributions) | 2019-12-31 | $409,261,646 |
| Total loss/gain on sale of assets | 2019-12-31 | $8,195,867 |
| Total of all expenses incurred | 2019-12-31 | $402,578 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2019-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2019-12-31 | $0 |
| Value of total assets at end of year | 2019-12-31 | $5,994,514,007 |
| Value of total assets at beginning of year | 2019-12-31 | $4,801,760,318 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2019-12-31 | $402,578 |
| Total interest from all sources | 2019-12-31 | $141,295,615 |
| Total dividends received (eg from common stock, registered investment company shares) | 2019-12-31 | $0 |
| Administrative expenses professional fees incurred | 2019-12-31 | $7,461 |
| Assets. Other investments not covered elsewhere at end of year | 2019-12-31 | $114,580,075 |
| Assets. Other investments not covered elsewhere at beginning of year | 2019-12-31 | $88,973,055 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2019-12-31 | $187,507,320 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2019-12-31 | $142,274,493 |
| Assets. Loans (other than to participants) at end of year | 2019-12-31 | $106,615,762 |
| Assets. Loans (other than to participants) at beginning of year | 2019-12-31 | $83,472,364 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2019-12-31 | $726,723,417 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2019-12-31 | $554,222,522 |
| Administrative expenses (other) incurred | 2019-12-31 | $395,117 |
| Total non interest bearing cash at end of year | 2019-12-31 | $10,857 |
| Total non interest bearing cash at beginning of year | 2019-12-31 | $10,662 |
| Value of net income/loss | 2019-12-31 | $408,859,068 |
| Value of net assets at end of year (total assets less liabilities) | 2019-12-31 | $5,267,790,590 |
| Value of net assets at beginning of year (total assets less liabilities) | 2019-12-31 | $4,247,537,796 |
| Income. Interest from loans (other than to participants) | 2019-12-31 | $2,988,013 |
| Interest earned on other investments | 2019-12-31 | $4,616,680 |
| Income. Interest from US Government securities | 2019-12-31 | $80,706,988 |
| Income. Interest from corporate debt instruments | 2019-12-31 | $49,419,863 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2019-12-31 | $581,781,044 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2019-12-31 | $455,106,007 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2019-12-31 | $455,106,007 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2019-12-31 | $3,564,071 |
| Asset value of US Government securities at end of year | 2019-12-31 | $3,544,964,251 |
| Asset value of US Government securities at beginning of year | 2019-12-31 | $2,838,083,817 |
| Asset. Corporate debt instrument preferred debt at end of year | 2019-12-31 | $761,207,940 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2019-12-31 | $660,982,389 |
| Asset. Corporate debt instrument debt (other) at end of year | 2019-12-31 | $697,846,758 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2019-12-31 | $532,857,531 |
| Aggregate proceeds on sale of assets | 2019-12-31 | $3,498,340,265 |
| Aggregate carrying amount (costs) on sale of assets | 2019-12-31 | $3,490,144,398 |
| 2018 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2018 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2018-12-31 | $-95,654,940 |
| Total unrealized appreciation/depreciation of assets | 2018-12-31 | $-95,654,940 |
| Total transfer of assets to this plan | 2018-12-31 | $1,037,264,887 |
| Total transfer of assets from this plan | 2018-12-31 | $850,619,250 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2018-12-31 | $554,222,522 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2018-12-31 | $809,917,542 |
| Total income from all sources (including contributions) | 2018-12-31 | $7,453,652 |
| Total loss/gain on sale of assets | 2018-12-31 | $-16,139,216 |
| Total of all expenses incurred | 2018-12-31 | $497,490 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2018-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2018-12-31 | $0 |
| Value of total assets at end of year | 2018-12-31 | $4,801,760,318 |
| Value of total assets at beginning of year | 2018-12-31 | $4,863,853,539 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2018-12-31 | $497,490 |
| Total interest from all sources | 2018-12-31 | $119,247,808 |
| Total dividends received (eg from common stock, registered investment company shares) | 2018-12-31 | $0 |
| Administrative expenses professional fees incurred | 2018-12-31 | $9,599 |
| Assets. Other investments not covered elsewhere at end of year | 2018-12-31 | $88,973,055 |
| Assets. Other investments not covered elsewhere at beginning of year | 2018-12-31 | $85,049,961 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2018-12-31 | $142,274,493 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2018-12-31 | $212,061,827 |
| Assets. Loans (other than to participants) at end of year | 2018-12-31 | $83,472,364 |
| Assets. Loans (other than to participants) at beginning of year | 2018-12-31 | $70,986,206 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2018-12-31 | $554,222,522 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2018-12-31 | $809,917,542 |
| Administrative expenses (other) incurred | 2018-12-31 | $487,891 |
| Total non interest bearing cash at end of year | 2018-12-31 | $10,662 |
| Total non interest bearing cash at beginning of year | 2018-12-31 | $294,443 |
| Value of net income/loss | 2018-12-31 | $6,956,162 |
| Value of net assets at end of year (total assets less liabilities) | 2018-12-31 | $4,247,537,796 |
| Value of net assets at beginning of year (total assets less liabilities) | 2018-12-31 | $4,053,935,997 |
| Income. Interest from loans (other than to participants) | 2018-12-31 | $2,665,694 |
| Interest earned on other investments | 2018-12-31 | $4,328,789 |
| Income. Interest from US Government securities | 2018-12-31 | $67,550,295 |
| Income. Interest from corporate debt instruments | 2018-12-31 | $42,471,953 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2018-12-31 | $455,106,007 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2018-12-31 | $644,348,910 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2018-12-31 | $644,348,910 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2018-12-31 | $2,231,077 |
| Asset value of US Government securities at end of year | 2018-12-31 | $2,838,083,817 |
| Asset value of US Government securities at beginning of year | 2018-12-31 | $2,704,576,974 |
| Asset. Corporate debt instrument preferred debt at end of year | 2018-12-31 | $660,982,389 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2018-12-31 | $640,222,456 |
| Asset. Corporate debt instrument debt (other) at end of year | 2018-12-31 | $532,857,531 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2018-12-31 | $506,312,762 |
| Aggregate proceeds on sale of assets | 2018-12-31 | $2,609,038,367 |
| Aggregate carrying amount (costs) on sale of assets | 2018-12-31 | $2,625,177,583 |
| 2017 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2017 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2017-12-31 | $20,041,394 |
| Total unrealized appreciation/depreciation of assets | 2017-12-31 | $20,041,394 |
| Total transfer of assets to this plan | 2017-12-31 | $1,762,830,476 |
| Total transfer of assets from this plan | 2017-12-31 | $829,971,485 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2017-12-31 | $809,917,542 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2017-12-31 | $438,071,752 |
| Total income from all sources (including contributions) | 2017-12-31 | $107,019,522 |
| Total loss/gain on sale of assets | 2017-12-31 | $5,056,746 |
| Total of all expenses incurred | 2017-12-31 | $373,836 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2017-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2017-12-31 | $0 |
| Value of total assets at end of year | 2017-12-31 | $4,863,853,539 |
| Value of total assets at beginning of year | 2017-12-31 | $3,452,503,072 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2017-12-31 | $373,836 |
| Total interest from all sources | 2017-12-31 | $81,921,382 |
| Total dividends received (eg from common stock, registered investment company shares) | 2017-12-31 | $0 |
| Administrative expenses professional fees incurred | 2017-12-31 | $7,853 |
| Assets. Other investments not covered elsewhere at end of year | 2017-12-31 | $85,049,961 |
| Assets. Other investments not covered elsewhere at beginning of year | 2017-12-31 | $73,018,444 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2017-12-31 | $212,061,827 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2017-12-31 | $100,399,157 |
| Assets. Loans (other than to participants) at end of year | 2017-12-31 | $70,986,206 |
| Assets. Loans (other than to participants) at beginning of year | 2017-12-31 | $48,045,974 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2017-12-31 | $809,917,542 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2017-12-31 | $438,071,752 |
| Administrative expenses (other) incurred | 2017-12-31 | $365,983 |
| Total non interest bearing cash at end of year | 2017-12-31 | $294,443 |
| Total non interest bearing cash at beginning of year | 2017-12-31 | $27,145 |
| Value of net income/loss | 2017-12-31 | $106,645,686 |
| Value of net assets at end of year (total assets less liabilities) | 2017-12-31 | $4,053,935,997 |
| Value of net assets at beginning of year (total assets less liabilities) | 2017-12-31 | $3,014,431,320 |
| Income. Interest from loans (other than to participants) | 2017-12-31 | $1,766,733 |
| Interest earned on other investments | 2017-12-31 | $3,775,850 |
| Income. Interest from US Government securities | 2017-12-31 | $44,792,360 |
| Income. Interest from corporate debt instruments | 2017-12-31 | $30,582,826 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2017-12-31 | $644,348,910 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2017-12-31 | $391,325,618 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2017-12-31 | $391,325,618 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2017-12-31 | $1,003,613 |
| Asset value of US Government securities at end of year | 2017-12-31 | $2,704,576,974 |
| Asset value of US Government securities at beginning of year | 2017-12-31 | $1,977,407,437 |
| Asset. Corporate debt instrument preferred debt at end of year | 2017-12-31 | $640,222,456 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2017-12-31 | $488,119,910 |
| Asset. Corporate debt instrument debt (other) at end of year | 2017-12-31 | $506,312,762 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2017-12-31 | $374,159,387 |
| Aggregate proceeds on sale of assets | 2017-12-31 | $2,719,352,868 |
| Aggregate carrying amount (costs) on sale of assets | 2017-12-31 | $2,714,296,122 |
| 2016 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2016 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2016-12-31 | $20,529,679 |
| Total unrealized appreciation/depreciation of assets | 2016-12-31 | $20,529,679 |
| Total transfer of assets to this plan | 2016-12-31 | $744,111,590 |
| Total transfer of assets from this plan | 2016-12-31 | $913,533,537 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2016-12-31 | $438,071,752 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2016-12-31 | $308,218,002 |
| Total income from all sources (including contributions) | 2016-12-31 | $89,957,470 |
| Total loss/gain on sale of assets | 2016-12-31 | $-8,194,046 |
| Total of all expenses incurred | 2016-12-31 | $371,402 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2016-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2016-12-31 | $0 |
| Value of total assets at end of year | 2016-12-31 | $3,452,503,072 |
| Value of total assets at beginning of year | 2016-12-31 | $3,402,485,201 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2016-12-31 | $371,402 |
| Total interest from all sources | 2016-12-31 | $77,621,837 |
| Total dividends received (eg from common stock, registered investment company shares) | 2016-12-31 | $0 |
| Administrative expenses professional fees incurred | 2016-12-31 | $9,084 |
| Assets. Other investments not covered elsewhere at end of year | 2016-12-31 | $73,018,444 |
| Assets. Other investments not covered elsewhere at beginning of year | 2016-12-31 | $82,323,351 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2016-12-31 | $100,399,157 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2016-12-31 | $57,491,497 |
| Assets. Loans (other than to participants) at end of year | 2016-12-31 | $48,045,974 |
| Assets. Loans (other than to participants) at beginning of year | 2016-12-31 | $53,697,878 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2016-12-31 | $438,071,752 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2016-12-31 | $308,218,002 |
| Administrative expenses (other) incurred | 2016-12-31 | $362,318 |
| Total non interest bearing cash at end of year | 2016-12-31 | $27,145 |
| Total non interest bearing cash at beginning of year | 2016-12-31 | $0 |
| Value of net income/loss | 2016-12-31 | $89,586,068 |
| Value of net assets at end of year (total assets less liabilities) | 2016-12-31 | $3,014,431,320 |
| Value of net assets at beginning of year (total assets less liabilities) | 2016-12-31 | $3,094,267,199 |
| Income. Interest from loans (other than to participants) | 2016-12-31 | $-6,303,170 |
| Interest earned on other investments | 2016-12-31 | $3,588,525 |
| Income. Interest from US Government securities | 2016-12-31 | $49,593,406 |
| Income. Interest from corporate debt instruments | 2016-12-31 | $30,244,324 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2016-12-31 | $391,325,618 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2016-12-31 | $270,830,021 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2016-12-31 | $270,830,021 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2016-12-31 | $498,752 |
| Asset value of US Government securities at end of year | 2016-12-31 | $1,977,407,437 |
| Asset value of US Government securities at beginning of year | 2016-12-31 | $2,098,259,758 |
| Asset. Corporate debt instrument preferred debt at end of year | 2016-12-31 | $488,119,910 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2016-12-31 | $480,849,264 |
| Asset. Corporate debt instrument debt (other) at end of year | 2016-12-31 | $374,159,387 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2016-12-31 | $359,033,432 |
| Aggregate proceeds on sale of assets | 2016-12-31 | $1,797,229,541 |
| Aggregate carrying amount (costs) on sale of assets | 2016-12-31 | $1,805,423,587 |
| 2015 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2015 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2015-12-31 | $-44,839,357 |
| Total unrealized appreciation/depreciation of assets | 2015-12-31 | $-44,839,357 |
| Total transfer of assets to this plan | 2015-12-31 | $915,954,668 |
| Total transfer of assets from this plan | 2015-12-31 | $996,589,182 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2015-12-31 | $308,218,002 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2015-12-31 | $713,326,216 |
| Total income from all sources (including contributions) | 2015-12-31 | $19,866,225 |
| Total loss/gain on sale of assets | 2015-12-31 | $-15,840,780 |
| Total of all expenses incurred | 2015-12-31 | $361,412 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2015-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2015-12-31 | $0 |
| Value of total assets at end of year | 2015-12-31 | $3,402,485,201 |
| Value of total assets at beginning of year | 2015-12-31 | $3,868,723,116 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2015-12-31 | $361,412 |
| Total interest from all sources | 2015-12-31 | $80,546,362 |
| Total dividends received (eg from common stock, registered investment company shares) | 2015-12-31 | $0 |
| Administrative expenses professional fees incurred | 2015-12-31 | $9,987 |
| Assets. Other investments not covered elsewhere at end of year | 2015-12-31 | $82,323,351 |
| Assets. Other investments not covered elsewhere at beginning of year | 2015-12-31 | $92,178,900 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2015-12-31 | $57,491,497 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2015-12-31 | $54,868,403 |
| Assets. Loans (other than to participants) at end of year | 2015-12-31 | $53,697,878 |
| Assets. Loans (other than to participants) at beginning of year | 2015-12-31 | $62,398,157 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2015-12-31 | $308,218,002 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2015-12-31 | $713,326,216 |
| Administrative expenses (other) incurred | 2015-12-31 | $351,425 |
| Total non interest bearing cash at end of year | 2015-12-31 | $0 |
| Total non interest bearing cash at beginning of year | 2015-12-31 | $0 |
| Value of net income/loss | 2015-12-31 | $19,504,813 |
| Value of net assets at end of year (total assets less liabilities) | 2015-12-31 | $3,094,267,199 |
| Value of net assets at beginning of year (total assets less liabilities) | 2015-12-31 | $3,155,396,900 |
| Income. Interest from loans (other than to participants) | 2015-12-31 | $2,204,645 |
| Interest earned on other investments | 2015-12-31 | $-3,808,857 |
| Income. Interest from US Government securities | 2015-12-31 | $51,184,612 |
| Income. Interest from corporate debt instruments | 2015-12-31 | $30,699,885 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2015-12-31 | $270,830,021 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2015-12-31 | $678,875,019 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2015-12-31 | $678,875,019 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2015-12-31 | $266,077 |
| Asset value of US Government securities at end of year | 2015-12-31 | $2,098,259,758 |
| Asset value of US Government securities at beginning of year | 2015-12-31 | $2,136,974,154 |
| Asset. Corporate debt instrument preferred debt at end of year | 2015-12-31 | $480,849,264 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2015-12-31 | $530,073,635 |
| Asset. Corporate debt instrument debt (other) at end of year | 2015-12-31 | $359,033,432 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2015-12-31 | $313,354,848 |
| Aggregate proceeds on sale of assets | 2015-12-31 | $2,245,891,072 |
| Aggregate carrying amount (costs) on sale of assets | 2015-12-31 | $2,261,731,852 |
| 2014 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2014 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2014-12-31 | $113,128,065 |
| Total unrealized appreciation/depreciation of assets | 2014-12-31 | $113,128,065 |
| Total transfer of assets to this plan | 2014-12-31 | $978,266,778 |
| Total transfer of assets from this plan | 2014-12-31 | $1,603,934,995 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2014-12-31 | $713,326,216 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2014-12-31 | $782,167,821 |
| Total income from all sources (including contributions) | 2014-12-31 | $211,527,938 |
| Total loss/gain on sale of assets | 2014-12-31 | $4,476,632 |
| Total of all expenses incurred | 2014-12-31 | $418,618 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2014-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2014-12-31 | $0 |
| Value of total assets at end of year | 2014-12-31 | $3,868,723,116 |
| Value of total assets at beginning of year | 2014-12-31 | $4,352,123,618 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2014-12-31 | $418,618 |
| Total interest from all sources | 2014-12-31 | $93,923,241 |
| Total dividends received (eg from common stock, registered investment company shares) | 2014-12-31 | $0 |
| Administrative expenses professional fees incurred | 2014-12-31 | $12,964 |
| Assets. Other investments not covered elsewhere at end of year | 2014-12-31 | $92,178,900 |
| Assets. Other investments not covered elsewhere at beginning of year | 2014-12-31 | $100,138,701 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2014-12-31 | $54,868,403 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2014-12-31 | $57,542,708 |
| Assets. Loans (other than to participants) at end of year | 2014-12-31 | $62,398,157 |
| Assets. Loans (other than to participants) at beginning of year | 2014-12-31 | $56,868,227 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2014-12-31 | $713,326,216 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2014-12-31 | $782,167,821 |
| Administrative expenses (other) incurred | 2014-12-31 | $405,654 |
| Total non interest bearing cash at end of year | 2014-12-31 | $0 |
| Total non interest bearing cash at beginning of year | 2014-12-31 | $2,569 |
| Value of net income/loss | 2014-12-31 | $211,109,320 |
| Value of net assets at end of year (total assets less liabilities) | 2014-12-31 | $3,155,396,900 |
| Value of net assets at beginning of year (total assets less liabilities) | 2014-12-31 | $3,569,955,797 |
| Income. Interest from loans (other than to participants) | 2014-12-31 | $2,893,327 |
| Interest earned on other investments | 2014-12-31 | $-1,508,329 |
| Income. Interest from US Government securities | 2014-12-31 | $58,106,427 |
| Income. Interest from corporate debt instruments | 2014-12-31 | $34,071,050 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2014-12-31 | $678,875,019 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2014-12-31 | $786,691,669 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2014-12-31 | $786,691,669 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2014-12-31 | $360,766 |
| Asset value of US Government securities at end of year | 2014-12-31 | $2,136,974,154 |
| Asset value of US Government securities at beginning of year | 2014-12-31 | $2,460,613,098 |
| Asset. Corporate debt instrument preferred debt at end of year | 2014-12-31 | $530,073,635 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2014-12-31 | $580,353,711 |
| Asset. Corporate debt instrument debt (other) at end of year | 2014-12-31 | $313,354,848 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2014-12-31 | $309,912,935 |
| Aggregate proceeds on sale of assets | 2014-12-31 | $3,037,969,169 |
| Aggregate carrying amount (costs) on sale of assets | 2014-12-31 | $3,033,492,537 |
| 2013 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2013 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2013-12-31 | $-111,201,586 |
| Total unrealized appreciation/depreciation of assets | 2013-12-31 | $-111,201,586 |
| Total transfer of assets to this plan | 2013-12-31 | $1,397,930,342 |
| Total transfer of assets from this plan | 2013-12-31 | $797,456,283 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2013-12-31 | $782,167,821 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2013-12-31 | $673,876,187 |
| Total income from all sources (including contributions) | 2013-12-31 | $-62,923,309 |
| Total loss/gain on sale of assets | 2013-12-31 | $-30,605,996 |
| Total of all expenses incurred | 2013-12-31 | $586,693 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2013-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2013-12-31 | $0 |
| Value of total assets at end of year | 2013-12-31 | $4,352,123,618 |
| Value of total assets at beginning of year | 2013-12-31 | $3,706,867,927 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2013-12-31 | $586,693 |
| Total interest from all sources | 2013-12-31 | $78,884,273 |
| Total dividends received (eg from common stock, registered investment company shares) | 2013-12-31 | $0 |
| Administrative expenses professional fees incurred | 2013-12-31 | $12,640 |
| Assets. Other investments not covered elsewhere at end of year | 2013-12-31 | $100,138,701 |
| Assets. Other investments not covered elsewhere at beginning of year | 2013-12-31 | $77,840,165 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2013-12-31 | $57,542,708 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2013-12-31 | $42,328,330 |
| Assets. Loans (other than to participants) at end of year | 2013-12-31 | $56,868,227 |
| Assets. Loans (other than to participants) at beginning of year | 2013-12-31 | $52,479,117 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2013-12-31 | $782,167,821 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2013-12-31 | $673,876,187 |
| Administrative expenses (other) incurred | 2013-12-31 | $574,053 |
| Total non interest bearing cash at end of year | 2013-12-31 | $2,569 |
| Total non interest bearing cash at beginning of year | 2013-12-31 | $0 |
| Value of net income/loss | 2013-12-31 | $-63,510,002 |
| Value of net assets at end of year (total assets less liabilities) | 2013-12-31 | $3,569,955,797 |
| Value of net assets at beginning of year (total assets less liabilities) | 2013-12-31 | $3,032,991,740 |
| Income. Interest from loans (other than to participants) | 2013-12-31 | $-9,211,430 |
| Interest earned on other investments | 2013-12-31 | $4,450,119 |
| Income. Interest from US Government securities | 2013-12-31 | $53,925,061 |
| Income. Interest from corporate debt instruments | 2013-12-31 | $29,439,315 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2013-12-31 | $786,691,669 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2013-12-31 | $693,120,370 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2013-12-31 | $693,120,370 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2013-12-31 | $281,208 |
| Asset value of US Government securities at end of year | 2013-12-31 | $2,460,613,098 |
| Asset value of US Government securities at beginning of year | 2013-12-31 | $2,114,029,012 |
| Asset. Corporate debt instrument preferred debt at end of year | 2013-12-31 | $580,353,711 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2013-12-31 | $488,178,241 |
| Asset. Corporate debt instrument debt (other) at end of year | 2013-12-31 | $309,912,935 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2013-12-31 | $238,892,692 |
| Aggregate proceeds on sale of assets | 2013-12-31 | $2,238,853,715 |
| Aggregate carrying amount (costs) on sale of assets | 2013-12-31 | $2,269,459,711 |
| 2012 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2012 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2012-12-31 | $53,910,307 |
| Total unrealized appreciation/depreciation of assets | 2012-12-31 | $53,910,307 |
| Total transfer of assets to this plan | 2012-12-31 | $1,515,698,735 |
| Total transfer of assets from this plan | 2012-12-31 | $1,791,737,668 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2012-12-31 | $673,876,187 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2012-12-31 | $852,346,899 |
| Total income from all sources (including contributions) | 2012-12-31 | $119,685,376 |
| Total loss/gain on sale of assets | 2012-12-31 | $-11,709,939 |
| Total of all expenses incurred | 2012-12-31 | $563,507 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2012-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2012-12-31 | $0 |
| Value of total assets at end of year | 2012-12-31 | $3,706,867,927 |
| Value of total assets at beginning of year | 2012-12-31 | $4,042,255,703 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2012-12-31 | $563,507 |
| Total interest from all sources | 2012-12-31 | $77,485,008 |
| Total dividends received (eg from common stock, registered investment company shares) | 2012-12-31 | $0 |
| Administrative expenses professional fees incurred | 2012-12-31 | $13,385 |
| Assets. Other investments not covered elsewhere at end of year | 2012-12-31 | $77,840,165 |
| Assets. Other investments not covered elsewhere at beginning of year | 2012-12-31 | $88,917,732 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2012-12-31 | $42,328,330 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2012-12-31 | $101,684,333 |
| Assets. Loans (other than to participants) at end of year | 2012-12-31 | $52,479,117 |
| Assets. Loans (other than to participants) at beginning of year | 2012-12-31 | $60,533,411 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2012-12-31 | $673,876,187 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2012-12-31 | $852,346,899 |
| Administrative expenses (other) incurred | 2012-12-31 | $550,122 |
| Total non interest bearing cash at end of year | 2012-12-31 | $0 |
| Total non interest bearing cash at beginning of year | 2012-12-31 | $8,366 |
| Value of net income/loss | 2012-12-31 | $119,121,869 |
| Value of net assets at end of year (total assets less liabilities) | 2012-12-31 | $3,032,991,740 |
| Value of net assets at beginning of year (total assets less liabilities) | 2012-12-31 | $3,189,908,804 |
| Income. Interest from loans (other than to participants) | 2012-12-31 | $-7,506,500 |
| Interest earned on other investments | 2012-12-31 | $4,200,194 |
| Income. Interest from US Government securities | 2012-12-31 | $53,380,810 |
| Income. Interest from corporate debt instruments | 2012-12-31 | $26,984,411 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2012-12-31 | $693,120,370 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2012-12-31 | $866,414,400 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2012-12-31 | $866,414,400 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2012-12-31 | $426,093 |
| Asset value of US Government securities at end of year | 2012-12-31 | $2,114,029,012 |
| Asset value of US Government securities at beginning of year | 2012-12-31 | $2,228,636,443 |
| Asset. Corporate debt instrument preferred debt at end of year | 2012-12-31 | $488,178,241 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2012-12-31 | $458,865,169 |
| Asset. Corporate debt instrument debt (other) at end of year | 2012-12-31 | $238,892,692 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2012-12-31 | $237,195,849 |
| Aggregate proceeds on sale of assets | 2012-12-31 | $1,979,018,008 |
| Aggregate carrying amount (costs) on sale of assets | 2012-12-31 | $1,990,727,947 |
| 2011 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2011 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2011-12-31 | $224,489,483 |
| Total unrealized appreciation/depreciation of assets | 2011-12-31 | $224,489,483 |
| Total transfer of assets to this plan | 2011-12-31 | $1,924,285,748 |
| Total transfer of assets from this plan | 2011-12-31 | $5,114,048,366 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2011-12-31 | $852,346,899 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2011-12-31 | $1,271,784,354 |
| Total income from all sources (including contributions) | 2011-12-31 | $384,267,528 |
| Total loss/gain on sale of assets | 2011-12-31 | $-13,658,499 |
| Total of all expenses incurred | 2011-12-31 | $1,035,727 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2011-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2011-12-31 | $0 |
| Value of total assets at end of year | 2011-12-31 | $4,042,255,703 |
| Value of total assets at beginning of year | 2011-12-31 | $7,268,223,975 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2011-12-31 | $1,035,727 |
| Total interest from all sources | 2011-12-31 | $173,436,544 |
| Total dividends received (eg from common stock, registered investment company shares) | 2011-12-31 | $0 |
| Administrative expenses professional fees incurred | 2011-12-31 | $34,714 |
| Assets. Other investments not covered elsewhere at end of year | 2011-12-31 | $88,917,732 |
| Assets. Other investments not covered elsewhere at beginning of year | 2011-12-31 | $154,454,352 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2011-12-31 | $101,684,333 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2011-12-31 | $194,964,626 |
| Assets. Loans (other than to participants) at end of year | 2011-12-31 | $60,533,411 |
| Assets. Loans (other than to participants) at beginning of year | 2011-12-31 | $163,829,947 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2011-12-31 | $852,346,899 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2011-12-31 | $1,271,784,354 |
| Administrative expenses (other) incurred | 2011-12-31 | $1,001,013 |
| Total non interest bearing cash at end of year | 2011-12-31 | $8,366 |
| Total non interest bearing cash at beginning of year | 2011-12-31 | $11,052 |
| Value of net income/loss | 2011-12-31 | $383,231,801 |
| Value of net assets at end of year (total assets less liabilities) | 2011-12-31 | $3,189,908,804 |
| Value of net assets at beginning of year (total assets less liabilities) | 2011-12-31 | $5,996,439,621 |
| Income. Interest from loans (other than to participants) | 2011-12-31 | $-5,976,089 |
| Interest earned on other investments | 2011-12-31 | $8,161,582 |
| Income. Interest from US Government securities | 2011-12-31 | $116,870,266 |
| Income. Interest from corporate debt instruments | 2011-12-31 | $53,909,382 |
| Value of interest in common/collective trusts at beginning of year | 2011-12-31 | $0 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2011-12-31 | $866,414,400 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2011-12-31 | $1,132,363,615 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2011-12-31 | $1,132,363,615 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2011-12-31 | $471,403 |
| Asset value of US Government securities at end of year | 2011-12-31 | $2,228,636,443 |
| Asset value of US Government securities at beginning of year | 2011-12-31 | $4,289,104,717 |
| Asset. Corporate debt instrument preferred debt at end of year | 2011-12-31 | $458,865,169 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2011-12-31 | $920,014,407 |
| Asset. Corporate debt instrument debt (other) at end of year | 2011-12-31 | $237,195,849 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2011-12-31 | $413,481,259 |
| Aggregate proceeds on sale of assets | 2011-12-31 | $3,133,935,512 |
| Aggregate carrying amount (costs) on sale of assets | 2011-12-31 | $3,147,594,011 |
| 2010 : STATE STREET U.S. BOND INDEX SECURITIES LENDING SERIES FUND CLASS I 2010 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2010-12-31 | $256,016,146 |
| Total unrealized appreciation/depreciation of assets | 2010-12-31 | $256,016,146 |
| Total transfer of assets to this plan | 2010-12-31 | $2,469,780,865 |
| Total transfer of assets from this plan | 2010-12-31 | $3,642,475,609 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2010-12-31 | $1,271,784,354 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2010-12-31 | $2,696,512,464 |
| Total income from all sources (including contributions) | 2010-12-31 | $484,301,014 |
| Total loss/gain on sale of assets | 2010-12-31 | $1,753,026 |
| Total of all expenses incurred | 2010-12-31 | $1,366,874 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2010-12-31 | $0 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2010-12-31 | $0 |
| Value of total assets at end of year | 2010-12-31 | $7,268,223,975 |
| Value of total assets at beginning of year | 2010-12-31 | $9,382,712,689 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2010-12-31 | $1,366,874 |
| Total interest from all sources | 2010-12-31 | $226,531,842 |
| Total dividends received (eg from common stock, registered investment company shares) | 2010-12-31 | $0 |
| Administrative expenses professional fees incurred | 2010-12-31 | $59,079 |
| Assets. Other investments not covered elsewhere at end of year | 2010-12-31 | $154,454,352 |
| Assets. Other investments not covered elsewhere at beginning of year | 2010-12-31 | $125,713,743 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2010-12-31 | $194,964,626 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2010-12-31 | $117,567,111 |
| Assets. Loans (other than to participants) at end of year | 2010-12-31 | $163,829,947 |
| Assets. Loans (other than to participants) at beginning of year | 2010-12-31 | $226,303,670 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2010-12-31 | $1,271,784,354 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2010-12-31 | $2,696,512,464 |
| Administrative expenses (other) incurred | 2010-12-31 | $1,307,795 |
| Total non interest bearing cash at end of year | 2010-12-31 | $11,052 |
| Value of net income/loss | 2010-12-31 | $482,934,140 |
| Value of net assets at end of year (total assets less liabilities) | 2010-12-31 | $5,996,439,621 |
| Value of net assets at beginning of year (total assets less liabilities) | 2010-12-31 | $6,686,200,225 |
| Income. Interest from loans (other than to participants) | 2010-12-31 | $-10,201,717 |
| Interest earned on other investments | 2010-12-31 | $8,681,485 |
| Income. Interest from US Government securities | 2010-12-31 | $156,929,537 |
| Income. Interest from corporate debt instruments | 2010-12-31 | $70,355,173 |
| Value of interest in common/collective trusts at end of year | 2010-12-31 | $0 |
| Value of interest in common/collective trusts at beginning of year | 2010-12-31 | $0 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2010-12-31 | $1,132,363,615 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2010-12-31 | $2,584,464,006 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2010-12-31 | $2,584,464,006 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2010-12-31 | $767,364 |
| Asset value of US Government securities at end of year | 2010-12-31 | $4,289,104,717 |
| Asset value of US Government securities at beginning of year | 2010-12-31 | $4,773,351,523 |
| Asset. Corporate debt instrument preferred debt at end of year | 2010-12-31 | $920,014,407 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2010-12-31 | $1,072,377,106 |
| Asset. Corporate debt instrument debt (other) at end of year | 2010-12-31 | $413,481,259 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2010-12-31 | $482,935,530 |
| Aggregate proceeds on sale of assets | 2010-12-31 | $6,621,390,938 |
| Aggregate carrying amount (costs) on sale of assets | 2010-12-31 | $6,619,637,912 |
