STATE STREET GLOBAL ADVISORS TRUST COMPANY has sponsored the creation of one or more 401k plans.
Submission information for form 5500 for 401k plan SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND
401k plan membership statisitcs for SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND
| Measure | Date | Value |
|---|
| 2023 : SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND 2023 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2023-12-31 | $101,369,547 |
| Total unrealized appreciation/depreciation of assets | 2023-12-31 | $101,369,547 |
| Total transfer of assets to this plan | 2023-12-31 | $521,783,159 |
| Total transfer of assets from this plan | 2023-12-31 | $724,209,616 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2023-12-31 | $58,717,838 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2023-12-31 | $137,977,428 |
| Total income from all sources (including contributions) | 2023-12-31 | $78,197,741 |
| Total loss/gain on sale of assets | 2023-12-31 | $-77,373,359 |
| Total of all expenses incurred | 2023-12-31 | $182,944 |
| 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 | $1,628,604,711 |
| Value of total assets at beginning of year | 2023-12-31 | $1,832,275,961 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2023-12-31 | $182,944 |
| Total interest from all sources | 2023-12-31 | $54,201,553 |
| 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 | $25,032,914 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2023-12-31 | $46,756,603 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2023-12-31 | $58,717,838 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2023-12-31 | $137,977,428 |
| Administrative expenses (other) incurred | 2023-12-31 | $582 |
| 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 | $63,051 |
| Value of net income/loss | 2023-12-31 | $78,014,797 |
| Value of net assets at end of year (total assets less liabilities) | 2023-12-31 | $1,569,886,873 |
| Value of net assets at beginning of year (total assets less liabilities) | 2023-12-31 | $1,694,298,533 |
| Interest earned on other investments | 2023-12-31 | $63,195 |
| Income. Interest from US Government securities | 2023-12-31 | $50,722,466 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2023-12-31 | $41,991,601 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2023-12-31 | $84,652,147 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2023-12-31 | $84,652,147 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2023-12-31 | $3,415,892 |
| Asset value of US Government securities at end of year | 2023-12-31 | $1,561,580,196 |
| Asset value of US Government securities at beginning of year | 2023-12-31 | $1,700,804,160 |
| Contract administrator fees | 2023-12-31 | $158,851 |
| Aggregate proceeds on sale of assets | 2023-12-31 | $2,390,022,542 |
| Aggregate carrying amount (costs) on sale of assets | 2023-12-31 | $2,467,395,901 |
| 2022 : SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND 2022 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2022-12-31 | $-227,968,144 |
| Total unrealized appreciation/depreciation of assets | 2022-12-31 | $-227,968,144 |
| Total transfer of assets to this plan | 2022-12-31 | $681,814,642 |
| Total transfer of assets from this plan | 2022-12-31 | $684,196,621 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-12-31 | $137,977,428 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-12-31 | $193,173,962 |
| Total income from all sources (including contributions) | 2022-12-31 | $-240,017,659 |
| Total loss/gain on sale of assets | 2022-12-31 | $-53,806,596 |
| Total of all expenses incurred | 2022-12-31 | $177,646 |
| 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 | $1,832,275,961 |
| Value of total assets at beginning of year | 2022-12-31 | $2,130,049,779 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2022-12-31 | $177,646 |
| Total interest from all sources | 2022-12-31 | $41,757,081 |
| Total dividends received (eg from common stock, registered investment company shares) | 2022-12-31 | $0 |
| Administrative expenses professional fees incurred | 2022-12-31 | $13,933 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2022-12-31 | $46,756,603 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2022-12-31 | $12,729,540 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2022-12-31 | $137,977,428 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2022-12-31 | $193,173,962 |
| Administrative expenses (other) incurred | 2022-12-31 | $163,713 |
| Total non interest bearing cash at end of year | 2022-12-31 | $63,051 |
| Total non interest bearing cash at beginning of year | 2022-12-31 | $0 |
| Value of net income/loss | 2022-12-31 | $-240,195,305 |
| Value of net assets at end of year (total assets less liabilities) | 2022-12-31 | $1,694,298,533 |
| Value of net assets at beginning of year (total assets less liabilities) | 2022-12-31 | $1,936,875,817 |
| Income. Interest from US Government securities | 2022-12-31 | $39,388,324 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2022-12-31 | $84,652,147 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2022-12-31 | $187,250,615 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2022-12-31 | $187,250,615 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2022-12-31 | $2,368,757 |
| Asset value of US Government securities at end of year | 2022-12-31 | $1,700,804,160 |
| Asset value of US Government securities at beginning of year | 2022-12-31 | $1,930,069,624 |
| Aggregate proceeds on sale of assets | 2022-12-31 | $3,778,848,287 |
| Aggregate carrying amount (costs) on sale of assets | 2022-12-31 | $3,832,654,883 |
| 2021 : SSGA U.S. MORTGAGE BACKED INDEX NON-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 | $647,328,894 |
| Total transfer of assets from this plan | 2021-12-31 | $205,682,227 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2021-12-31 | $193,173,962 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2021-12-31 | $251,988,736 |
| 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 | $-20,034,145 |
| Total loss/gain on sale of assets | 2021-12-31 | $-37,715,448 |
| Total of all expenses incurred | 2021-12-31 | $185,376 |
| 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 | $2,130,049,779 |
| Value of total assets at beginning of year | 2021-12-31 | $1,767,437,407 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2021-12-31 | $185,376 |
| Total interest from all sources | 2021-12-31 | $22,254,744 |
| 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 | $30,263 |
| 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 | $12,729,540 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2021-12-31 | $11,841,704 |
| 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 | $193,173,962 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2021-12-31 | $251,988,736 |
| Other income not declared elsewhere | 2021-12-31 | $0 |
| Administrative expenses (other) incurred | 2021-12-31 | $155,113 |
| 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 | $-20,219,521 |
| Value of net assets at end of year (total assets less liabilities) | 2021-12-31 | $1,936,875,817 |
| Value of net assets at beginning of year (total assets less liabilities) | 2021-12-31 | $1,515,448,671 |
| 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 | $21,865,057 |
| 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 | $187,250,615 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2021-12-31 | $250,352,137 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2021-12-31 | $250,352,137 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2021-12-31 | $389,687 |
| 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 | $1,930,069,624 |
| Asset value of US Government securities at beginning of year | 2021-12-31 | $1,505,243,566 |
| 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 | $-4,573,441 |
| 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 | $5,869,628,334 |
| Aggregate carrying amount (costs) on sale of assets | 2021-12-31 | $5,907,343,782 |
| 2020 : SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND 2020 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2020-12-31 | $43,486,463 |
| Total unrealized appreciation/depreciation of assets | 2020-12-31 | $43,486,463 |
| Total transfer of assets to this plan | 2020-12-31 | $597,758,991 |
| Total transfer of assets from this plan | 2020-12-31 | $996,930,425 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2020-12-31 | $251,988,736 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2020-12-31 | $85,779,149 |
| Total income from all sources (including contributions) | 2020-12-31 | $59,954,729 |
| Total loss/gain on sale of assets | 2020-12-31 | $-13,843,405 |
| Total of all expenses incurred | 2020-12-31 | $166,327 |
| 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 | $1,767,437,407 |
| Value of total assets at beginning of year | 2020-12-31 | $1,940,610,852 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2020-12-31 | $166,327 |
| Total interest from all sources | 2020-12-31 | $30,311,671 |
| Total dividends received (eg from common stock, registered investment company shares) | 2020-12-31 | $0 |
| Administrative expenses professional fees incurred | 2020-12-31 | $27,906 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2020-12-31 | $11,841,704 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2020-12-31 | $26,684,272 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2020-12-31 | $251,988,736 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2020-12-31 | $85,779,149 |
| Administrative expenses (other) incurred | 2020-12-31 | $138,421 |
| Value of net income/loss | 2020-12-31 | $59,788,402 |
| Value of net assets at end of year (total assets less liabilities) | 2020-12-31 | $1,515,448,671 |
| Value of net assets at beginning of year (total assets less liabilities) | 2020-12-31 | $1,854,831,703 |
| Income. Interest from US Government securities | 2020-12-31 | $29,723,644 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2020-12-31 | $250,352,137 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2020-12-31 | $67,276,761 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2020-12-31 | $67,276,761 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2020-12-31 | $588,027 |
| Asset value of US Government securities at end of year | 2020-12-31 | $1,505,243,566 |
| Asset value of US Government securities at beginning of year | 2020-12-31 | $1,846,649,819 |
| Aggregate proceeds on sale of assets | 2020-12-31 | $3,376,129,459 |
| Aggregate carrying amount (costs) on sale of assets | 2020-12-31 | $3,389,972,864 |
| 2019 : SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND 2019 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2019-12-31 | $70,992,820 |
| Total unrealized appreciation/depreciation of assets | 2019-12-31 | $70,992,820 |
| Total transfer of assets to this plan | 2019-12-31 | $313,432,365 |
| Total transfer of assets from this plan | 2019-12-31 | $1,113,821,860 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $85,779,149 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $68,141,503 |
| Total income from all sources (including contributions) | 2019-12-31 | $136,156,139 |
| Total loss/gain on sale of assets | 2019-12-31 | $3,341,064 |
| Total of all expenses incurred | 2019-12-31 | $240,343 |
| 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 | $1,940,610,852 |
| Value of total assets at beginning of year | 2019-12-31 | $2,587,446,905 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2019-12-31 | $240,343 |
| Total interest from all sources | 2019-12-31 | $61,822,255 |
| Total dividends received (eg from common stock, registered investment company shares) | 2019-12-31 | $0 |
| Administrative expenses professional fees incurred | 2019-12-31 | $30,914 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2019-12-31 | $26,684,272 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2019-12-31 | $32,448,041 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2019-12-31 | $85,779,149 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2019-12-31 | $68,141,503 |
| Administrative expenses (other) incurred | 2019-12-31 | $209,429 |
| Value of net income/loss | 2019-12-31 | $135,915,796 |
| Value of net assets at end of year (total assets less liabilities) | 2019-12-31 | $1,854,831,703 |
| Value of net assets at beginning of year (total assets less liabilities) | 2019-12-31 | $2,519,305,402 |
| Income. Interest from US Government securities | 2019-12-31 | $60,319,942 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2019-12-31 | $67,276,761 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2019-12-31 | $47,846,665 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2019-12-31 | $47,846,665 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2019-12-31 | $1,502,313 |
| Asset value of US Government securities at end of year | 2019-12-31 | $1,846,649,819 |
| Asset value of US Government securities at beginning of year | 2019-12-31 | $2,507,152,199 |
| Aggregate proceeds on sale of assets | 2019-12-31 | $2,347,993,839 |
| Aggregate carrying amount (costs) on sale of assets | 2019-12-31 | $2,344,652,775 |
| 2018 : SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND 2018 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2018-12-31 | $-25,718,401 |
| Total unrealized appreciation/depreciation of assets | 2018-12-31 | $-25,718,401 |
| Total transfer of assets to this plan | 2018-12-31 | $886,889,624 |
| Total transfer of assets from this plan | 2018-12-31 | $781,670,739 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2018-12-31 | $68,141,503 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2018-12-31 | $94,078,070 |
| Total income from all sources (including contributions) | 2018-12-31 | $25,641,720 |
| Total loss/gain on sale of assets | 2018-12-31 | $-21,969,216 |
| Total of all expenses incurred | 2018-12-31 | $273,046 |
| 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 | $2,587,446,905 |
| Value of total assets at beginning of year | 2018-12-31 | $2,482,795,913 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2018-12-31 | $273,046 |
| Total interest from all sources | 2018-12-31 | $73,329,337 |
| Total dividends received (eg from common stock, registered investment company shares) | 2018-12-31 | $0 |
| Administrative expenses professional fees incurred | 2018-12-31 | $31,967 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2018-12-31 | $32,448,041 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2018-12-31 | $10,515,215 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2018-12-31 | $68,141,503 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2018-12-31 | $94,078,070 |
| Administrative expenses (other) incurred | 2018-12-31 | $241,079 |
| Value of net income/loss | 2018-12-31 | $25,368,674 |
| Value of net assets at end of year (total assets less liabilities) | 2018-12-31 | $2,519,305,402 |
| Value of net assets at beginning of year (total assets less liabilities) | 2018-12-31 | $2,388,717,843 |
| Income. Interest from US Government securities | 2018-12-31 | $70,788,968 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2018-12-31 | $47,846,665 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2018-12-31 | $92,604,154 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2018-12-31 | $92,604,154 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2018-12-31 | $2,540,369 |
| Asset value of US Government securities at end of year | 2018-12-31 | $2,507,152,199 |
| Asset value of US Government securities at beginning of year | 2018-12-31 | $2,379,676,544 |
| Aggregate proceeds on sale of assets | 2018-12-31 | $3,355,156,211 |
| Aggregate carrying amount (costs) on sale of assets | 2018-12-31 | $3,377,125,427 |
| 2017 : SSGA U.S. MORTGAGE BACKED INDEX NON-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 | $6,435,009 |
| Total unrealized appreciation/depreciation of assets | 2017-12-31 | $6,435,009 |
| Total transfer of assets to this plan | 2017-12-31 | $356,619,070 |
| Total transfer of assets from this plan | 2017-12-31 | $291,753,837 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2017-12-31 | $94,078,070 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2017-12-31 | $221,314,517 |
| 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 | $58,003,202 |
| Total loss/gain on sale of assets | 2017-12-31 | $-13,042,496 |
| Total of all expenses incurred | 2017-12-31 | $302,712 |
| 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 | $2,482,795,913 |
| Value of total assets at beginning of year | 2017-12-31 | $2,487,466,637 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2017-12-31 | $302,712 |
| Total interest from all sources | 2017-12-31 | $64,610,689 |
| 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 | $31,480 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2017-12-31 | $10,515,215 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2017-12-31 | $9,984,923 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2017-12-31 | $94,078,070 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2017-12-31 | $221,314,517 |
| Other income not declared elsewhere | 2017-12-31 | $0 |
| Administrative expenses (other) incurred | 2017-12-31 | $271,232 |
| Value of net income/loss | 2017-12-31 | $57,700,490 |
| Value of net assets at end of year (total assets less liabilities) | 2017-12-31 | $2,388,717,843 |
| Value of net assets at beginning of year (total assets less liabilities) | 2017-12-31 | $2,266,152,120 |
| 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 | $63,217,730 |
| 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 | $92,604,154 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2017-12-31 | $221,243,394 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2017-12-31 | $221,243,394 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2017-12-31 | $1,392,959 |
| Asset value of US Government securities at end of year | 2017-12-31 | $2,379,676,544 |
| Asset value of US Government securities at beginning of year | 2017-12-31 | $2,256,238,320 |
| 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 | $3,097,562,536 |
| Aggregate carrying amount (costs) on sale of assets | 2017-12-31 | $3,110,605,032 |
| 2016 : SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND 2016 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2016-12-31 | $3,734,658 |
| Total unrealized appreciation/depreciation of assets | 2016-12-31 | $3,734,658 |
| Total transfer of assets to this plan | 2016-12-31 | $277,532,123 |
| Total transfer of assets from this plan | 2016-12-31 | $325,767,154 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2016-12-31 | $221,314,517 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2016-12-31 | $277,708,229 |
| Total income from all sources (including contributions) | 2016-12-31 | $39,124,376 |
| Total loss/gain on sale of assets | 2016-12-31 | $-21,785,006 |
| Total of all expenses incurred | 2016-12-31 | $284,329 |
| 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 | $2,487,466,637 |
| Value of total assets at beginning of year | 2016-12-31 | $2,553,255,333 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2016-12-31 | $284,329 |
| Total interest from all sources | 2016-12-31 | $57,174,724 |
| Total dividends received (eg from common stock, registered investment company shares) | 2016-12-31 | $0 |
| Administrative expenses professional fees incurred | 2016-12-31 | $31,161 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2016-12-31 | $9,984,923 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2016-12-31 | $63,658,848 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2016-12-31 | $221,314,517 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2016-12-31 | $277,708,229 |
| Administrative expenses (other) incurred | 2016-12-31 | $253,168 |
| Value of net income/loss | 2016-12-31 | $38,840,047 |
| Value of net assets at end of year (total assets less liabilities) | 2016-12-31 | $2,266,152,120 |
| Value of net assets at beginning of year (total assets less liabilities) | 2016-12-31 | $2,275,547,104 |
| Income. Interest from US Government securities | 2016-12-31 | $57,174,724 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2016-12-31 | $221,243,394 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2016-12-31 | $223,172,752 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2016-12-31 | $223,172,752 |
| Asset value of US Government securities at end of year | 2016-12-31 | $2,256,238,320 |
| Asset value of US Government securities at beginning of year | 2016-12-31 | $2,266,423,733 |
| Aggregate proceeds on sale of assets | 2016-12-31 | $2,666,353,254 |
| Aggregate carrying amount (costs) on sale of assets | 2016-12-31 | $2,688,138,260 |
| 2015 : SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND 2015 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2015-12-31 | $-299,890 |
| Total unrealized appreciation/depreciation of assets | 2015-12-31 | $-299,890 |
| Total transfer of assets to this plan | 2015-12-31 | $318,921,183 |
| Total transfer of assets from this plan | 2015-12-31 | $530,447,763 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2015-12-31 | $277,708,229 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2015-12-31 | $177,925,805 |
| Total income from all sources (including contributions) | 2015-12-31 | $36,350,359 |
| Total loss/gain on sale of assets | 2015-12-31 | $-28,420,268 |
| Total of all expenses incurred | 2015-12-31 | $293,244 |
| 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 | $2,553,255,333 |
| Value of total assets at beginning of year | 2015-12-31 | $2,628,942,374 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2015-12-31 | $293,244 |
| Total interest from all sources | 2015-12-31 | $65,070,517 |
| Total dividends received (eg from common stock, registered investment company shares) | 2015-12-31 | $0 |
| Administrative expenses professional fees incurred | 2015-12-31 | $29,984 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2015-12-31 | $63,658,848 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2015-12-31 | $20,681,829 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2015-12-31 | $277,708,229 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2015-12-31 | $177,925,805 |
| Administrative expenses (other) incurred | 2015-12-31 | $263,260 |
| Value of net income/loss | 2015-12-31 | $36,057,115 |
| Value of net assets at end of year (total assets less liabilities) | 2015-12-31 | $2,275,547,104 |
| Value of net assets at beginning of year (total assets less liabilities) | 2015-12-31 | $2,451,016,569 |
| Income. Interest from US Government securities | 2015-12-31 | $64,710,832 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2015-12-31 | $223,172,752 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2015-12-31 | $164,810,330 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2015-12-31 | $164,810,330 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2015-12-31 | $359,685 |
| Asset value of US Government securities at end of year | 2015-12-31 | $2,266,423,733 |
| Asset value of US Government securities at beginning of year | 2015-12-31 | $2,443,450,215 |
| Aggregate proceeds on sale of assets | 2015-12-31 | $2,639,215,095 |
| Aggregate carrying amount (costs) on sale of assets | 2015-12-31 | $2,667,635,363 |
| 2014 : SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND 2014 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2014-12-31 | $61,259,156 |
| Total unrealized appreciation/depreciation of assets | 2014-12-31 | $61,259,156 |
| Total transfer of assets to this plan | 2014-12-31 | $1,055,262,321 |
| Total transfer of assets from this plan | 2014-12-31 | $463,885,999 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2014-12-31 | $177,925,805 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2014-12-31 | $197,989,052 |
| Total income from all sources (including contributions) | 2014-12-31 | $117,757,643 |
| Total loss/gain on sale of assets | 2014-12-31 | $-4,089,234 |
| Total of all expenses incurred | 2014-12-31 | $246,811 |
| 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 | $2,628,942,374 |
| Value of total assets at beginning of year | 2014-12-31 | $1,940,118,467 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2014-12-31 | $246,811 |
| Total interest from all sources | 2014-12-31 | $60,587,721 |
| Total dividends received (eg from common stock, registered investment company shares) | 2014-12-31 | $0 |
| Administrative expenses professional fees incurred | 2014-12-31 | $30,290 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2014-12-31 | $20,681,829 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2014-12-31 | $67,049,623 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2014-12-31 | $177,925,805 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2014-12-31 | $197,989,052 |
| Administrative expenses (other) incurred | 2014-12-31 | $216,521 |
| Value of net income/loss | 2014-12-31 | $117,510,832 |
| Value of net assets at end of year (total assets less liabilities) | 2014-12-31 | $2,451,016,569 |
| Value of net assets at beginning of year (total assets less liabilities) | 2014-12-31 | $1,742,129,415 |
| Interest earned on other investments | 2014-12-31 | $-7,262,665 |
| Income. Interest from US Government securities | 2014-12-31 | $67,461,597 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2014-12-31 | $164,810,330 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2014-12-31 | $120,632,538 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2014-12-31 | $120,632,538 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2014-12-31 | $388,789 |
| Asset value of US Government securities at end of year | 2014-12-31 | $2,443,450,215 |
| Asset value of US Government securities at beginning of year | 2014-12-31 | $1,752,436,306 |
| Aggregate proceeds on sale of assets | 2014-12-31 | $3,282,741,583 |
| Aggregate carrying amount (costs) on sale of assets | 2014-12-31 | $3,286,830,817 |
| 2013 : SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND 2013 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2013-12-31 | $-32,995,828 |
| Total unrealized appreciation/depreciation of assets | 2013-12-31 | $-32,995,828 |
| Total transfer of assets to this plan | 2013-12-31 | $573,667,020 |
| Total transfer of assets from this plan | 2013-12-31 | $1,167,754,076 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2013-12-31 | $197,989,052 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2013-12-31 | $265,481,697 |
| Total income from all sources (including contributions) | 2013-12-31 | $-22,690,619 |
| Total loss/gain on sale of assets | 2013-12-31 | $-47,997,112 |
| Total of all expenses incurred | 2013-12-31 | $347,233 |
| 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 | $1,940,118,467 |
| Value of total assets at beginning of year | 2013-12-31 | $2,624,736,020 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2013-12-31 | $347,233 |
| Total interest from all sources | 2013-12-31 | $58,302,321 |
| Total dividends received (eg from common stock, registered investment company shares) | 2013-12-31 | $0 |
| Administrative expenses professional fees incurred | 2013-12-31 | $24,092 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2013-12-31 | $67,049,623 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2013-12-31 | $26,915,979 |
| 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 | $2,345,759,481 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2013-12-31 | $197,989,052 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2013-12-31 | $265,481,697 |
| Administrative expenses (other) incurred | 2013-12-31 | $323,141 |
| Value of net income/loss | 2013-12-31 | $-23,037,852 |
| Value of net assets at end of year (total assets less liabilities) | 2013-12-31 | $1,742,129,415 |
| Value of net assets at beginning of year (total assets less liabilities) | 2013-12-31 | $2,359,254,323 |
| Income. Interest from US Government securities | 2013-12-31 | $57,956,382 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2013-12-31 | $120,632,538 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2013-12-31 | $252,060,560 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2013-12-31 | $252,060,560 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2013-12-31 | $345,939 |
| Asset value of US Government securities at end of year | 2013-12-31 | $1,752,436,306 |
| Asset value of US Government securities at beginning of year | 2013-12-31 | $0 |
| Aggregate proceeds on sale of assets | 2013-12-31 | $2,923,738,975 |
| Aggregate carrying amount (costs) on sale of assets | 2013-12-31 | $2,971,736,087 |
| 2012 : SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND 2012 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2012-12-31 | $25,342,780 |
| Total unrealized appreciation/depreciation of assets | 2012-12-31 | $25,342,780 |
| Total transfer of assets to this plan | 2012-12-31 | $415,814,251 |
| Total transfer of assets from this plan | 2012-12-31 | $1,374,133,349 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2012-12-31 | $265,481,697 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2012-12-31 | $122,828,484 |
| Total income from all sources (including contributions) | 2012-12-31 | $81,741,994 |
| Total loss/gain on sale of assets | 2012-12-31 | $-47,054,186 |
| Total of all expenses incurred | 2012-12-31 | $569,506 |
| 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 | $2,624,736,020 |
| Value of total assets at beginning of year | 2012-12-31 | $3,359,229,417 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2012-12-31 | $569,506 |
| Total interest from all sources | 2012-12-31 | $103,453,400 |
| Total dividends received (eg from common stock, registered investment company shares) | 2012-12-31 | $0 |
| Administrative expenses professional fees incurred | 2012-12-31 | $31,887 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2012-12-31 | $26,915,979 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2012-12-31 | $13,632,214 |
| Assets. Loans (other than to participants) at end of year | 2012-12-31 | $2,345,759,481 |
| 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 | $265,481,697 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2012-12-31 | $122,828,484 |
| Administrative expenses (other) incurred | 2012-12-31 | $537,619 |
| Value of net income/loss | 2012-12-31 | $81,172,488 |
| Value of net assets at end of year (total assets less liabilities) | 2012-12-31 | $2,359,254,323 |
| Value of net assets at beginning of year (total assets less liabilities) | 2012-12-31 | $3,236,400,933 |
| Income. Interest from loans (other than to participants) | 2012-12-31 | $102,803,302 |
| 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 | $252,060,560 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2012-12-31 | $131,894,272 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2012-12-31 | $131,894,272 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2012-12-31 | $650,098 |
| 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 | $3,213,702,931 |
| Aggregate proceeds on sale of assets | 2012-12-31 | $4,348,022,690 |
| Aggregate carrying amount (costs) on sale of assets | 2012-12-31 | $4,395,076,876 |
| 2011 : SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND 2011 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2011-12-31 | $104,072,646 |
| Total unrealized appreciation/depreciation of assets | 2011-12-31 | $104,072,646 |
| Total transfer of assets to this plan | 2011-12-31 | $1,102,141,685 |
| Total transfer of assets from this plan | 2011-12-31 | $2,077,282,273 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2011-12-31 | $122,828,484 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2011-12-31 | $548,767,272 |
| Total income from all sources (including contributions) | 2011-12-31 | $244,286,039 |
| Total loss/gain on sale of assets | 2011-12-31 | $-21,338,453 |
| Total of all expenses incurred | 2011-12-31 | $791,174 |
| 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 | $3,359,229,417 |
| Value of total assets at beginning of year | 2011-12-31 | $4,516,813,928 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2011-12-31 | $791,174 |
| Total interest from all sources | 2011-12-31 | $161,551,846 |
| Total dividends received (eg from common stock, registered investment company shares) | 2011-12-31 | $0 |
| Administrative expenses professional fees incurred | 2011-12-31 | $37,232 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2011-12-31 | $13,632,214 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2011-12-31 | $268,164,024 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2011-12-31 | $122,828,484 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2011-12-31 | $548,767,272 |
| Administrative expenses (other) incurred | 2011-12-31 | $753,942 |
| Value of net income/loss | 2011-12-31 | $243,494,865 |
| Value of net assets at end of year (total assets less liabilities) | 2011-12-31 | $3,236,400,933 |
| Value of net assets at beginning of year (total assets less liabilities) | 2011-12-31 | $3,968,046,656 |
| Income. Interest from US Government securities | 2011-12-31 | $160,765,693 |
| 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 | $131,894,272 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2011-12-31 | $125,945,875 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2011-12-31 | $125,945,875 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2011-12-31 | $786,153 |
| 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 | $4,122,704,029 |
| Asset. Corporate debt instrument debt (other) at end of year | 2011-12-31 | $3,213,702,931 |
| Aggregate proceeds on sale of assets | 2011-12-31 | $6,879,054,530 |
| Aggregate carrying amount (costs) on sale of assets | 2011-12-31 | $6,900,392,983 |
| 2010 : SSGA U.S. MORTGAGE BACKED INDEX NON-LENDING FUND 2010 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2010-12-31 | $52,397,032 |
| Total unrealized appreciation/depreciation of assets | 2010-12-31 | $52,397,032 |
| Total transfer of assets to this plan | 2010-12-31 | $3,029,807,542 |
| Total transfer of assets from this plan | 2010-12-31 | $3,126,990,283 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2010-12-31 | $548,767,272 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2010-12-31 | $846,127,030 |
| Total income from all sources (including contributions) | 2010-12-31 | $218,625,621 |
| Total loss/gain on sale of assets | 2010-12-31 | $-9,264,167 |
| Total of all expenses incurred | 2010-12-31 | $880,191 |
| 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 | $4,516,813,928 |
| Value of total assets at beginning of year | 2010-12-31 | $4,693,610,997 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2010-12-31 | $880,191 |
| Total interest from all sources | 2010-12-31 | $175,492,756 |
| Total dividends received (eg from common stock, registered investment company shares) | 2010-12-31 | $0 |
| Administrative expenses professional fees incurred | 2010-12-31 | $65,607 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2010-12-31 | $268,164,024 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2010-12-31 | $105,072,806 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2010-12-31 | $548,767,272 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2010-12-31 | $846,127,030 |
| Administrative expenses (other) incurred | 2010-12-31 | $814,584 |
| Value of net income/loss | 2010-12-31 | $217,745,430 |
| Value of net assets at end of year (total assets less liabilities) | 2010-12-31 | $3,968,046,656 |
| Value of net assets at beginning of year (total assets less liabilities) | 2010-12-31 | $3,847,483,967 |
| Income. Interest from US Government securities | 2010-12-31 | $174,246,842 |
| 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 | $125,945,875 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2010-12-31 | $773,261,485 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2010-12-31 | $773,261,485 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2010-12-31 | $1,245,914 |
| Asset value of US Government securities at end of year | 2010-12-31 | $4,122,704,029 |
| Asset value of US Government securities at beginning of year | 2010-12-31 | $3,815,276,706 |
| Aggregate proceeds on sale of assets | 2010-12-31 | $11,583,898,099 |
| Aggregate carrying amount (costs) on sale of assets | 2010-12-31 | $11,593,162,266 |
