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. MORTGAGE BACKED INDEX SECURITIES LENDING FUND
401k plan membership statisitcs for STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND
| Measure | Date | Value |
|---|
| 2023 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2023 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2023-12-31 | $29,164,225 |
| Total unrealized appreciation/depreciation of assets | 2023-12-31 | $29,164,225 |
| Total transfer of assets to this plan | 2023-12-31 | $146,663,931 |
| Total transfer of assets from this plan | 2023-12-31 | $564,799,393 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2023-12-31 | $16,893,241 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2023-12-31 | $68,755,405 |
| Total income from all sources (including contributions) | 2023-12-31 | $25,563,406 |
| Total loss/gain on sale of assets | 2023-12-31 | $-19,194,716 |
| Total of all expenses incurred | 2023-12-31 | $52,634 |
| 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 | $468,552,893 |
| Value of total assets at beginning of year | 2023-12-31 | $913,039,747 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2023-12-31 | $52,634 |
| Total interest from all sources | 2023-12-31 | $15,593,897 |
| Total dividends received (eg from common stock, registered investment company shares) | 2023-12-31 | $0 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2023-12-31 | $7,202,020 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2023-12-31 | $23,299,240 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2023-12-31 | $16,893,241 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2023-12-31 | $68,755,405 |
| Administrative expenses (other) incurred | 2023-12-31 | $168 |
| Total non interest bearing cash at end of year | 2023-12-31 | $0 |
| Total non interest bearing cash at beginning of year | 2023-12-31 | $31,419 |
| Value of net income/loss | 2023-12-31 | $25,510,772 |
| Value of net assets at end of year (total assets less liabilities) | 2023-12-31 | $451,659,652 |
| Value of net assets at beginning of year (total assets less liabilities) | 2023-12-31 | $844,284,342 |
| Interest earned on other investments | 2023-12-31 | $18,181 |
| Income. Interest from US Government securities | 2023-12-31 | $14,592,957 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2023-12-31 | $12,081,069 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2023-12-31 | $42,182,934 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2023-12-31 | $42,182,934 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2023-12-31 | $982,759 |
| Asset value of US Government securities at end of year | 2023-12-31 | $449,269,804 |
| Asset value of US Government securities at beginning of year | 2023-12-31 | $847,526,154 |
| Contract administrator fees | 2023-12-31 | $45,702 |
| Aggregate proceeds on sale of assets | 2023-12-31 | $687,614,355 |
| Aggregate carrying amount (costs) on sale of assets | 2023-12-31 | $706,809,071 |
| 2022 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2022 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2022-12-31 | $-113,598,595 |
| Total unrealized appreciation/depreciation of assets | 2022-12-31 | $-113,598,595 |
| Total transfer of assets to this plan | 2022-12-31 | $521,520,828 |
| Total transfer of assets from this plan | 2022-12-31 | $70,253,020 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-12-31 | $68,755,405 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-12-31 | $48,640,579 |
| Total income from all sources (including contributions) | 2022-12-31 | $-94,594,011 |
| Total loss/gain on sale of assets | 2022-12-31 | $-1,803,348 |
| Total of all expenses incurred | 2022-12-31 | $88,523 |
| 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 | $913,039,747 |
| Value of total assets at beginning of year | 2022-12-31 | $536,339,647 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2022-12-31 | $88,523 |
| Total interest from all sources | 2022-12-31 | $20,807,932 |
| Total dividends received (eg from common stock, registered investment company shares) | 2022-12-31 | $0 |
| Administrative expenses professional fees incurred | 2022-12-31 | $6,943 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2022-12-31 | $23,299,240 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2022-12-31 | $3,205,257 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2022-12-31 | $68,755,405 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2022-12-31 | $48,640,579 |
| Administrative expenses (other) incurred | 2022-12-31 | $81,580 |
| Total non interest bearing cash at end of year | 2022-12-31 | $31,419 |
| Total non interest bearing cash at beginning of year | 2022-12-31 | $0 |
| Value of net income/loss | 2022-12-31 | $-94,682,534 |
| Value of net assets at end of year (total assets less liabilities) | 2022-12-31 | $844,284,342 |
| Value of net assets at beginning of year (total assets less liabilities) | 2022-12-31 | $487,699,068 |
| Income. Interest from US Government securities | 2022-12-31 | $19,627,559 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2022-12-31 | $42,182,934 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2022-12-31 | $47,149,099 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2022-12-31 | $47,149,099 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2022-12-31 | $1,180,373 |
| Asset value of US Government securities at end of year | 2022-12-31 | $847,526,154 |
| Asset value of US Government securities at beginning of year | 2022-12-31 | $485,985,291 |
| Aggregate proceeds on sale of assets | 2022-12-31 | $1,883,034,407 |
| Aggregate carrying amount (costs) on sale of assets | 2022-12-31 | $1,884,837,755 |
| 2021 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2021 401k financial data |
|---|
| Unrealized appreciation/depreciation of real estate assets | 2021-12-31 | $0 |
| Unrealized appreciation/depreciation of other (non real estate) assets | 2021-12-31 | $0 |
| Total unrealized appreciation/depreciation of assets | 2021-12-31 | $0 |
| Total transfer of assets to this plan | 2021-12-31 | $221,604,977 |
| Total transfer of assets from this plan | 2021-12-31 | $122,175,322 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2021-12-31 | $48,640,579 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2021-12-31 | $65,315,409 |
| Expenses. Interest paid | 2021-12-31 | $0 |
| Amount of participant contributions which was failed to transmit to the plan within the time period described in 29 CFR 251.3-102 | 2021-12-31 | $0 |
| Total income from all sources (including contributions) | 2021-12-31 | $-4,491,958 |
| Total loss/gain on sale of assets | 2021-12-31 | $-8,682,592 |
| Total of all expenses incurred | 2021-12-31 | $42,492 |
| 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 | $536,339,647 |
| Value of total assets at beginning of year | 2021-12-31 | $458,119,272 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2021-12-31 | $42,492 |
| Total interest from all sources | 2021-12-31 | $5,101,295 |
| Total dividends received (eg from common stock, registered investment company shares) | 2021-12-31 | $0 |
| Total dividends received from registered investment company shares (eg mutual funds) | 2021-12-31 | $0 |
| Assets. Real estate other than employer real property at end of year | 2021-12-31 | $0 |
| Assets. Real estate other than employer real property at beginning of year | 2021-12-31 | $0 |
| Administrative expenses professional fees incurred | 2021-12-31 | $6,937 |
| Assets. Corporate prefeered stocks other than exployer securities at end of year | 2021-12-31 | $0 |
| Assets. Corporate prefeered stocks other than exployer securities at beginning of year | 2021-12-31 | $0 |
| Assets. Other investments not covered elsewhere at end of year | 2021-12-31 | $0 |
| Assets. Other investments not covered elsewhere at beginning of year | 2021-12-31 | $0 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2021-12-31 | $3,205,257 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2021-12-31 | $3,069,366 |
| Assets. Loans (other than to participants) at end of year | 2021-12-31 | $0 |
| Assets. Loans (other than to participants) at beginning of year | 2021-12-31 | $0 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2021-12-31 | $48,640,579 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2021-12-31 | $65,315,409 |
| Other income not declared elsewhere | 2021-12-31 | $0 |
| Administrative expenses (other) incurred | 2021-12-31 | $35,555 |
| 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 | $0 |
| Value of net income/loss | 2021-12-31 | $-4,534,450 |
| Value of net assets at end of year (total assets less liabilities) | 2021-12-31 | $487,699,068 |
| Value of net assets at beginning of year (total assets less liabilities) | 2021-12-31 | $392,803,863 |
| Investment advisory and management fees | 2021-12-31 | $0 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2021-12-31 | $0 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2021-12-31 | $0 |
| Income. Interest from loans (other than to participants) | 2021-12-31 | $0 |
| Interest earned on other investments | 2021-12-31 | $0 |
| Income. Interest from US Government securities | 2021-12-31 | $5,011,970 |
| Income. Interest from corporate debt instruments | 2021-12-31 | $0 |
| Value of interest in common/collective trusts at end of year | 2021-12-31 | $0 |
| Value of interest in common/collective trusts at beginning of year | 2021-12-31 | $0 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2021-12-31 | $47,149,099 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2021-12-31 | $64,891,203 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2021-12-31 | $64,891,203 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2021-12-31 | $89,325 |
| Value of funds held in insurance company general accounts (unallocated contracts) at end of year | 2021-12-31 | $0 |
| Value of funds held in insurance company general accounts (unallocated contracts) at beginning of year | 2021-12-31 | $0 |
| Asset value of US Government securities at end of year | 2021-12-31 | $485,985,291 |
| Asset value of US Government securities at beginning of year | 2021-12-31 | $390,158,703 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2021-12-31 | $0 |
| Net investment gain or loss from common/collective trusts | 2021-12-31 | $-910,661 |
| Income. Dividends from preferred stock | 2021-12-31 | $0 |
| Income. Dividends from common stock | 2021-12-31 | $0 |
| Asset. Corporate debt instrument preferred debt at end of year | 2021-12-31 | $0 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2021-12-31 | $0 |
| Asset. Corporate debt instrument debt (other) at end of year | 2021-12-31 | $0 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2021-12-31 | $0 |
| Contract administrator fees | 2021-12-31 | $0 |
| Assets. Corporate common stocks other than exployer securities at end of year | 2021-12-31 | $0 |
| Assets. Corporate common stocks other than exployer securities at beginning of year | 2021-12-31 | $0 |
| Aggregate proceeds on sale of assets | 2021-12-31 | $1,345,452,649 |
| Aggregate carrying amount (costs) on sale of assets | 2021-12-31 | $1,354,135,241 |
| 2020 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2020 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2020-12-31 | $10,611,803 |
| Total unrealized appreciation/depreciation of assets | 2020-12-31 | $10,611,803 |
| Total transfer of assets to this plan | 2020-12-31 | $63,868,840 |
| Total transfer of assets from this plan | 2020-12-31 | $85,823,427 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2020-12-31 | $65,315,409 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2020-12-31 | $18,505,155 |
| Total income from all sources (including contributions) | 2020-12-31 | $14,658,667 |
| Total loss/gain on sale of assets | 2020-12-31 | $-3,876,049 |
| Total of all expenses incurred | 2020-12-31 | $43,475 |
| 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 | $458,119,272 |
| Value of total assets at beginning of year | 2020-12-31 | $418,648,413 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2020-12-31 | $43,475 |
| Total interest from all sources | 2020-12-31 | $7,922,913 |
| Total dividends received (eg from common stock, registered investment company shares) | 2020-12-31 | $0 |
| Administrative expenses professional fees incurred | 2020-12-31 | $7,294 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2020-12-31 | $3,069,366 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2020-12-31 | $5,756,604 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2020-12-31 | $65,315,409 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2020-12-31 | $18,505,155 |
| Administrative expenses (other) incurred | 2020-12-31 | $36,181 |
| Value of net income/loss | 2020-12-31 | $14,615,192 |
| Value of net assets at end of year (total assets less liabilities) | 2020-12-31 | $392,803,863 |
| Value of net assets at beginning of year (total assets less liabilities) | 2020-12-31 | $400,143,258 |
| Income. Interest from US Government securities | 2020-12-31 | $7,769,213 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2020-12-31 | $64,891,203 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2020-12-31 | $14,513,631 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2020-12-31 | $14,513,631 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2020-12-31 | $153,700 |
| Asset value of US Government securities at end of year | 2020-12-31 | $390,158,703 |
| Asset value of US Government securities at beginning of year | 2020-12-31 | $398,378,178 |
| Aggregate proceeds on sale of assets | 2020-12-31 | $882,458,066 |
| Aggregate carrying amount (costs) on sale of assets | 2020-12-31 | $886,334,115 |
| 2019 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2019 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2019-12-31 | $10,574,410 |
| Total unrealized appreciation/depreciation of assets | 2019-12-31 | $10,574,410 |
| Total transfer of assets to this plan | 2019-12-31 | $112,817,340 |
| Total transfer of assets from this plan | 2019-12-31 | $62,149,764 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $18,505,155 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $8,866,367 |
| Total income from all sources (including contributions) | 2019-12-31 | $21,712,368 |
| Total loss/gain on sale of assets | 2019-12-31 | $566,138 |
| Total of all expenses incurred | 2019-12-31 | $41,099 |
| 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 | $418,648,413 |
| Value of total assets at beginning of year | 2019-12-31 | $336,670,780 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2019-12-31 | $41,099 |
| Total interest from all sources | 2019-12-31 | $10,571,820 |
| Total dividends received (eg from common stock, registered investment company shares) | 2019-12-31 | $0 |
| Administrative expenses professional fees incurred | 2019-12-31 | $5,286 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2019-12-31 | $5,756,604 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2019-12-31 | $4,222,041 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2019-12-31 | $18,505,155 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2019-12-31 | $8,866,367 |
| Administrative expenses (other) incurred | 2019-12-31 | $35,813 |
| Value of net income/loss | 2019-12-31 | $21,671,269 |
| Value of net assets at end of year (total assets less liabilities) | 2019-12-31 | $400,143,258 |
| Value of net assets at beginning of year (total assets less liabilities) | 2019-12-31 | $327,804,413 |
| Income. Interest from US Government securities | 2019-12-31 | $10,314,919 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2019-12-31 | $14,513,631 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2019-12-31 | $6,225,664 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2019-12-31 | $6,225,664 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2019-12-31 | $256,901 |
| Asset value of US Government securities at end of year | 2019-12-31 | $398,378,178 |
| Asset value of US Government securities at beginning of year | 2019-12-31 | $326,223,075 |
| Aggregate proceeds on sale of assets | 2019-12-31 | $401,515,108 |
| Aggregate carrying amount (costs) on sale of assets | 2019-12-31 | $400,948,970 |
| 2018 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2018 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2018-12-31 | $-3,903,050 |
| Total unrealized appreciation/depreciation of assets | 2018-12-31 | $-3,903,050 |
| Total transfer of assets to this plan | 2018-12-31 | $50,257,299 |
| Total transfer of assets from this plan | 2018-12-31 | $68,840,139 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2018-12-31 | $8,866,367 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2018-12-31 | $13,530,687 |
| Total income from all sources (including contributions) | 2018-12-31 | $2,868,393 |
| Total loss/gain on sale of assets | 2018-12-31 | $-2,937,370 |
| Total of all expenses incurred | 2018-12-31 | $36,151 |
| 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 | $336,670,780 |
| Value of total assets at beginning of year | 2018-12-31 | $357,085,698 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2018-12-31 | $36,151 |
| Total interest from all sources | 2018-12-31 | $9,708,813 |
| Total dividends received (eg from common stock, registered investment company shares) | 2018-12-31 | $0 |
| Administrative expenses professional fees incurred | 2018-12-31 | $4,233 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2018-12-31 | $4,222,041 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2018-12-31 | $1,512,341 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2018-12-31 | $8,866,367 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2018-12-31 | $13,530,687 |
| Administrative expenses (other) incurred | 2018-12-31 | $31,918 |
| Value of net income/loss | 2018-12-31 | $2,832,242 |
| Value of net assets at end of year (total assets less liabilities) | 2018-12-31 | $327,804,413 |
| Value of net assets at beginning of year (total assets less liabilities) | 2018-12-31 | $343,555,011 |
| Income. Interest from US Government securities | 2018-12-31 | $9,372,468 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2018-12-31 | $6,225,664 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2018-12-31 | $13,318,702 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2018-12-31 | $13,318,702 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2018-12-31 | $336,345 |
| Asset value of US Government securities at end of year | 2018-12-31 | $326,223,075 |
| Asset value of US Government securities at beginning of year | 2018-12-31 | $342,254,655 |
| Aggregate proceeds on sale of assets | 2018-12-31 | $444,223,107 |
| Aggregate carrying amount (costs) on sale of assets | 2018-12-31 | $447,160,477 |
| 2017 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2017 401k financial data |
|---|
| Unrealized appreciation/depreciation of real estate assets | 2017-12-31 | $0 |
| Unrealized appreciation/depreciation of other (non real estate) assets | 2017-12-31 | $1,419,639 |
| Total unrealized appreciation/depreciation of assets | 2017-12-31 | $1,419,639 |
| Total transfer of assets to this plan | 2017-12-31 | $41,497,026 |
| Total transfer of assets from this plan | 2017-12-31 | $142,388,754 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2017-12-31 | $13,530,687 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2017-12-31 | $42,353,457 |
| Expenses. Interest paid | 2017-12-31 | $0 |
| Amount of participant contributions which was failed to transmit to the plan within the time period described in 29 CFR 251.3-102 | 2017-12-31 | $0 |
| Total income from all sources (including contributions) | 2017-12-31 | $10,823,116 |
| Total loss/gain on sale of assets | 2017-12-31 | $-2,336,874 |
| Total of all expenses incurred | 2017-12-31 | $55,005 |
| 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 | $357,085,698 |
| Value of total assets at beginning of year | 2017-12-31 | $476,032,085 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2017-12-31 | $55,005 |
| Total interest from all sources | 2017-12-31 | $11,740,351 |
| Total dividends received (eg from common stock, registered investment company shares) | 2017-12-31 | $0 |
| Total dividends received from registered investment company shares (eg mutual funds) | 2017-12-31 | $0 |
| Administrative expenses professional fees incurred | 2017-12-31 | $5,720 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2017-12-31 | $1,512,341 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2017-12-31 | $1,910,837 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2017-12-31 | $13,530,687 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2017-12-31 | $42,353,457 |
| Other income not declared elsewhere | 2017-12-31 | $0 |
| Administrative expenses (other) incurred | 2017-12-31 | $49,285 |
| Value of net income/loss | 2017-12-31 | $10,768,111 |
| Value of net assets at end of year (total assets less liabilities) | 2017-12-31 | $343,555,011 |
| Value of net assets at beginning of year (total assets less liabilities) | 2017-12-31 | $433,678,628 |
| Investment advisory and management fees | 2017-12-31 | $0 |
| Income. Interest from loans (other than to participants) | 2017-12-31 | $0 |
| Interest earned on other investments | 2017-12-31 | $0 |
| Income. Interest from US Government securities | 2017-12-31 | $11,487,238 |
| Income. Interest from corporate debt instruments | 2017-12-31 | $0 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2017-12-31 | $13,318,702 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2017-12-31 | $42,339,846 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2017-12-31 | $42,339,846 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2017-12-31 | $253,113 |
| Asset value of US Government securities at end of year | 2017-12-31 | $342,254,655 |
| Asset value of US Government securities at beginning of year | 2017-12-31 | $431,781,402 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2017-12-31 | $0 |
| Net investment gain or loss from common/collective trusts | 2017-12-31 | $0 |
| Income. Dividends from preferred stock | 2017-12-31 | $0 |
| Income. Dividends from common stock | 2017-12-31 | $0 |
| Contract administrator fees | 2017-12-31 | $0 |
| Aggregate proceeds on sale of assets | 2017-12-31 | $562,855,356 |
| Aggregate carrying amount (costs) on sale of assets | 2017-12-31 | $565,192,230 |
| 2016 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2016 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2016-12-31 | $575,317 |
| Total unrealized appreciation/depreciation of assets | 2016-12-31 | $575,317 |
| Total transfer of assets to this plan | 2016-12-31 | $33,495,658 |
| Total transfer of assets from this plan | 2016-12-31 | $64,820,727 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2016-12-31 | $42,353,457 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2016-12-31 | $55,848,880 |
| Total income from all sources (including contributions) | 2016-12-31 | $7,431,897 |
| Total loss/gain on sale of assets | 2016-12-31 | $-4,223,420 |
| Total of all expenses incurred | 2016-12-31 | $55,101 |
| 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 | $476,032,085 |
| Value of total assets at beginning of year | 2016-12-31 | $513,475,781 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2016-12-31 | $55,101 |
| Total interest from all sources | 2016-12-31 | $11,080,000 |
| Total dividends received (eg from common stock, registered investment company shares) | 2016-12-31 | $0 |
| Administrative expenses professional fees incurred | 2016-12-31 | $6,039 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2016-12-31 | $1,910,837 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2016-12-31 | $12,802,196 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2016-12-31 | $42,353,457 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2016-12-31 | $55,848,880 |
| Administrative expenses (other) incurred | 2016-12-31 | $49,062 |
| Value of net income/loss | 2016-12-31 | $7,376,796 |
| Value of net assets at end of year (total assets less liabilities) | 2016-12-31 | $433,678,628 |
| Value of net assets at beginning of year (total assets less liabilities) | 2016-12-31 | $457,626,901 |
| Income. Interest from US Government securities | 2016-12-31 | $11,080,000 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2016-12-31 | $42,339,846 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2016-12-31 | $44,881,451 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2016-12-31 | $44,881,451 |
| Asset value of US Government securities at end of year | 2016-12-31 | $431,781,402 |
| Asset value of US Government securities at beginning of year | 2016-12-31 | $455,792,134 |
| Aggregate proceeds on sale of assets | 2016-12-31 | $516,717,725 |
| Aggregate carrying amount (costs) on sale of assets | 2016-12-31 | $520,941,145 |
| 2015 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2015 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2015-12-31 | $185,035 |
| Total unrealized appreciation/depreciation of assets | 2015-12-31 | $185,035 |
| Total transfer of assets to this plan | 2015-12-31 | $55,203,413 |
| Total transfer of assets from this plan | 2015-12-31 | $198,405,716 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2015-12-31 | $55,848,880 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2015-12-31 | $43,053,898 |
| Total income from all sources (including contributions) | 2015-12-31 | $7,801,102 |
| Total loss/gain on sale of assets | 2015-12-31 | $-5,872,856 |
| Total of all expenses incurred | 2015-12-31 | $60,788 |
| 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 | $513,475,781 |
| Value of total assets at beginning of year | 2015-12-31 | $636,142,788 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2015-12-31 | $60,788 |
| Total interest from all sources | 2015-12-31 | $13,488,923 |
| Total dividends received (eg from common stock, registered investment company shares) | 2015-12-31 | $0 |
| Administrative expenses professional fees incurred | 2015-12-31 | $6,216 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2015-12-31 | $12,802,196 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2015-12-31 | $5,004,521 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2015-12-31 | $55,848,880 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2015-12-31 | $43,053,898 |
| Administrative expenses (other) incurred | 2015-12-31 | $54,572 |
| Value of net income/loss | 2015-12-31 | $7,740,314 |
| Value of net assets at end of year (total assets less liabilities) | 2015-12-31 | $457,626,901 |
| Value of net assets at beginning of year (total assets less liabilities) | 2015-12-31 | $593,088,890 |
| Income. Interest from US Government securities | 2015-12-31 | $13,414,361 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2015-12-31 | $44,881,451 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2015-12-31 | $39,880,259 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2015-12-31 | $39,880,259 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2015-12-31 | $74,562 |
| Asset value of US Government securities at end of year | 2015-12-31 | $455,792,134 |
| Asset value of US Government securities at beginning of year | 2015-12-31 | $591,258,008 |
| Aggregate proceeds on sale of assets | 2015-12-31 | $547,101,334 |
| Aggregate carrying amount (costs) on sale of assets | 2015-12-31 | $552,974,190 |
| 2014 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2014 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2014-12-31 | $19,267,895 |
| Total unrealized appreciation/depreciation of assets | 2014-12-31 | $19,267,895 |
| Total transfer of assets to this plan | 2014-12-31 | $111,088,916 |
| Total transfer of assets from this plan | 2014-12-31 | $209,934,891 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2014-12-31 | $43,053,898 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2014-12-31 | $74,493,256 |
| Total income from all sources (including contributions) | 2014-12-31 | $36,534,823 |
| Total loss/gain on sale of assets | 2014-12-31 | $-1,155,693 |
| Total of all expenses incurred | 2014-12-31 | $75,047 |
| 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 | $636,142,788 |
| Value of total assets at beginning of year | 2014-12-31 | $729,968,345 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2014-12-31 | $75,047 |
| Total interest from all sources | 2014-12-31 | $18,422,621 |
| Total dividends received (eg from common stock, registered investment company shares) | 2014-12-31 | $0 |
| Administrative expenses professional fees incurred | 2014-12-31 | $9,210 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2014-12-31 | $5,004,521 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2014-12-31 | $25,227,378 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2014-12-31 | $43,053,898 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2014-12-31 | $74,493,256 |
| Administrative expenses (other) incurred | 2014-12-31 | $65,837 |
| Value of net income/loss | 2014-12-31 | $36,459,776 |
| Value of net assets at end of year (total assets less liabilities) | 2014-12-31 | $593,088,890 |
| Value of net assets at beginning of year (total assets less liabilities) | 2014-12-31 | $655,475,089 |
| Interest earned on other investments | 2014-12-31 | $-2,208,324 |
| Income. Interest from US Government securities | 2014-12-31 | $20,512,728 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2014-12-31 | $39,880,259 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2014-12-31 | $45,387,916 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2014-12-31 | $45,387,916 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2014-12-31 | $118,217 |
| Asset value of US Government securities at end of year | 2014-12-31 | $591,258,008 |
| Asset value of US Government securities at beginning of year | 2014-12-31 | $659,353,051 |
| Aggregate proceeds on sale of assets | 2014-12-31 | $998,167,650 |
| Aggregate carrying amount (costs) on sale of assets | 2014-12-31 | $999,323,343 |
| 2013 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2013 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2013-12-31 | $-15,376,480 |
| Total unrealized appreciation/depreciation of assets | 2013-12-31 | $-15,376,480 |
| Total transfer of assets to this plan | 2013-12-31 | $188,174,549 |
| Total transfer of assets from this plan | 2013-12-31 | $329,897,623 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2013-12-31 | $74,493,256 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2013-12-31 | $90,973,976 |
| Total income from all sources (including contributions) | 2013-12-31 | $-11,113,940 |
| Total loss/gain on sale of assets | 2013-12-31 | $-20,198,216 |
| Total of all expenses incurred | 2013-12-31 | $145,682 |
| 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 | $729,968,345 |
| Value of total assets at beginning of year | 2013-12-31 | $899,431,761 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2013-12-31 | $145,682 |
| Total interest from all sources | 2013-12-31 | $24,460,756 |
| Total dividends received (eg from common stock, registered investment company shares) | 2013-12-31 | $0 |
| Administrative expenses professional fees incurred | 2013-12-31 | $10,108 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2013-12-31 | $25,227,378 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2013-12-31 | $9,223,437 |
| Assets. Loans (other than to participants) at end of year | 2013-12-31 | $0 |
| Assets. Loans (other than to participants) at beginning of year | 2013-12-31 | $803,833,438 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2013-12-31 | $74,493,256 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2013-12-31 | $90,973,976 |
| Administrative expenses (other) incurred | 2013-12-31 | $135,574 |
| Value of net income/loss | 2013-12-31 | $-11,259,622 |
| Value of net assets at end of year (total assets less liabilities) | 2013-12-31 | $655,475,089 |
| Value of net assets at beginning of year (total assets less liabilities) | 2013-12-31 | $808,457,785 |
| Income. Interest from US Government securities | 2013-12-31 | $24,315,617 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2013-12-31 | $45,387,916 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2013-12-31 | $86,374,886 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2013-12-31 | $86,374,886 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2013-12-31 | $145,139 |
| Asset value of US Government securities at end of year | 2013-12-31 | $659,353,051 |
| Asset value of US Government securities at beginning of year | 2013-12-31 | $0 |
| Aggregate proceeds on sale of assets | 2013-12-31 | $1,226,655,547 |
| Aggregate carrying amount (costs) on sale of assets | 2013-12-31 | $1,246,853,763 |
| 2012 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2012 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2012-12-31 | $6,665,173 |
| Total unrealized appreciation/depreciation of assets | 2012-12-31 | $6,665,173 |
| Total transfer of assets to this plan | 2012-12-31 | $152,132,898 |
| Total transfer of assets from this plan | 2012-12-31 | $184,919,042 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2012-12-31 | $90,973,976 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2012-12-31 | $31,055,297 |
| Total income from all sources (including contributions) | 2012-12-31 | $23,135,941 |
| Total loss/gain on sale of assets | 2012-12-31 | $-13,742,082 |
| Total of all expenses incurred | 2012-12-31 | $166,321 |
| 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 | $899,431,761 |
| Value of total assets at beginning of year | 2012-12-31 | $849,329,606 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2012-12-31 | $166,321 |
| Total interest from all sources | 2012-12-31 | $30,212,850 |
| Total dividends received (eg from common stock, registered investment company shares) | 2012-12-31 | $0 |
| Administrative expenses professional fees incurred | 2012-12-31 | $9,313 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2012-12-31 | $9,223,437 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2012-12-31 | $3,446,696 |
| Assets. Loans (other than to participants) at end of year | 2012-12-31 | $803,833,438 |
| Assets. Loans (other than to participants) at beginning of year | 2012-12-31 | $0 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2012-12-31 | $90,973,976 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2012-12-31 | $31,055,297 |
| Administrative expenses (other) incurred | 2012-12-31 | $157,008 |
| Value of net income/loss | 2012-12-31 | $22,969,620 |
| Value of net assets at end of year (total assets less liabilities) | 2012-12-31 | $808,457,785 |
| Value of net assets at beginning of year (total assets less liabilities) | 2012-12-31 | $818,274,309 |
| Income. Interest from loans (other than to participants) | 2012-12-31 | $30,022,993 |
| Value of interest in common/collective trusts at end of year | 2012-12-31 | $0 |
| Value of interest in common/collective trusts at beginning of year | 2012-12-31 | $0 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2012-12-31 | $86,374,886 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2012-12-31 | $33,347,443 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2012-12-31 | $33,347,443 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2012-12-31 | $189,857 |
| Asset value of US Government securities at end of year | 2012-12-31 | $0 |
| Asset value of US Government securities at beginning of year | 2012-12-31 | $0 |
| Asset. Corporate debt instrument debt (other) at end of year | 2012-12-31 | $0 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2012-12-31 | $812,535,467 |
| Aggregate proceeds on sale of assets | 2012-12-31 | $1,269,809,947 |
| Aggregate carrying amount (costs) on sale of assets | 2012-12-31 | $1,283,552,029 |
| 2011 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2011 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2011-12-31 | $24,842,344 |
| Total unrealized appreciation/depreciation of assets | 2011-12-31 | $24,842,344 |
| Total transfer of assets to this plan | 2011-12-31 | $145,415,079 |
| Total transfer of assets from this plan | 2011-12-31 | $324,728,431 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2011-12-31 | $31,055,297 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2011-12-31 | $129,883,308 |
| Total income from all sources (including contributions) | 2011-12-31 | $58,613,210 |
| Total loss/gain on sale of assets | 2011-12-31 | $-5,139,438 |
| Total of all expenses incurred | 2011-12-31 | $190,558 |
| 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 | $849,329,606 |
| Value of total assets at beginning of year | 2011-12-31 | $1,069,048,317 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2011-12-31 | $190,558 |
| Total interest from all sources | 2011-12-31 | $38,910,304 |
| Total dividends received (eg from common stock, registered investment company shares) | 2011-12-31 | $0 |
| Administrative expenses professional fees incurred | 2011-12-31 | $8,968 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2011-12-31 | $3,446,696 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2011-12-31 | $63,469,584 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2011-12-31 | $31,055,297 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2011-12-31 | $129,883,308 |
| Administrative expenses (other) incurred | 2011-12-31 | $181,590 |
| Value of net income/loss | 2011-12-31 | $58,422,652 |
| Value of net assets at end of year (total assets less liabilities) | 2011-12-31 | $818,274,309 |
| Value of net assets at beginning of year (total assets less liabilities) | 2011-12-31 | $939,165,009 |
| Income. Interest from US Government securities | 2011-12-31 | $38,720,957 |
| Value of interest in common/collective trusts at end of year | 2011-12-31 | $0 |
| 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 | $33,347,443 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2011-12-31 | $29,809,115 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2011-12-31 | $29,809,115 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2011-12-31 | $189,347 |
| Asset value of US Government securities at end of year | 2011-12-31 | $0 |
| Asset value of US Government securities at beginning of year | 2011-12-31 | $975,769,618 |
| Asset. Corporate debt instrument debt (other) at end of year | 2011-12-31 | $812,535,467 |
| Aggregate proceeds on sale of assets | 2011-12-31 | $1,656,843,395 |
| Aggregate carrying amount (costs) on sale of assets | 2011-12-31 | $1,661,982,833 |
| 2010 : STATE STREET U.S. MORTGAGE BACKED INDEX SECURITIES LENDING FUND 2010 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2010-12-31 | $38,459,598 |
| Total unrealized appreciation/depreciation of assets | 2010-12-31 | $38,459,598 |
| Total transfer of assets to this plan | 2010-12-31 | $85,767,157 |
| Total transfer of assets from this plan | 2010-12-31 | $1,445,756,382 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2010-12-31 | $129,883,308 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2010-12-31 | $752,874,975 |
| Total income from all sources (including contributions) | 2010-12-31 | $104,905,917 |
| Total loss/gain on sale of assets | 2010-12-31 | $-3,696,498 |
| Total of all expenses incurred | 2010-12-31 | $351,206 |
| 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 | $1,069,048,317 |
| Value of total assets at beginning of year | 2010-12-31 | $2,947,474,498 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2010-12-31 | $351,206 |
| Total interest from all sources | 2010-12-31 | $70,142,817 |
| Total dividends received (eg from common stock, registered investment company shares) | 2010-12-31 | $0 |
| Administrative expenses professional fees incurred | 2010-12-31 | $26,178 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2010-12-31 | $63,469,584 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2010-12-31 | $59,933,436 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2010-12-31 | $129,883,308 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2010-12-31 | $752,874,975 |
| Administrative expenses (other) incurred | 2010-12-31 | $325,028 |
| Value of net income/loss | 2010-12-31 | $104,554,711 |
| Value of net assets at end of year (total assets less liabilities) | 2010-12-31 | $939,165,009 |
| Value of net assets at beginning of year (total assets less liabilities) | 2010-12-31 | $2,194,599,523 |
| Interest earned on other investments | 2010-12-31 | $119,393 |
| Income. Interest from US Government securities | 2010-12-31 | $69,526,291 |
| 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 | $29,809,115 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2010-12-31 | $711,310,585 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2010-12-31 | $711,310,585 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2010-12-31 | $497,133 |
| Asset value of US Government securities at end of year | 2010-12-31 | $975,769,618 |
| Asset value of US Government securities at beginning of year | 2010-12-31 | $2,176,230,477 |
| Aggregate proceeds on sale of assets | 2010-12-31 | $4,622,095,120 |
| Aggregate carrying amount (costs) on sale of assets | 2010-12-31 | $4,625,791,618 |
