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 3-10 YEAR U.S. CREDIT INDEX SECURITIES LENDING FUND
401k plan membership statisitcs for STATE STREET 3-10 YEAR U.S. CREDIT INDEX SECURITIES LENDING FUND
| Measure | Date | Value |
|---|
| 2022 : STATE STREET 3-10 YEAR U.S. CREDIT INDEX SECURITIES LENDING FUND 2022 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2022-12-31 | $-98,922,195 |
| Total unrealized appreciation/depreciation of assets | 2022-12-31 | $-98,922,195 |
| Total transfer of assets to this plan | 2022-12-31 | $442,452,483 |
| Total transfer of assets from this plan | 2022-12-31 | $87,832,693 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-12-31 | $33,133,757 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-12-31 | $44,464,226 |
| Total income from all sources (including contributions) | 2022-12-31 | $-76,487,009 |
| Total loss/gain on sale of assets | 2022-12-31 | $-1,687,878 |
| Total of all expenses incurred | 2022-12-31 | $87,179 |
| 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 | $731,880,106 |
| Value of total assets at beginning of year | 2022-12-31 | $465,164,973 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2022-12-31 | $87,179 |
| Total interest from all sources | 2022-12-31 | $24,123,064 |
| Total dividends received (eg from common stock, registered investment company shares) | 2022-12-31 | $0 |
| Administrative expenses professional fees incurred | 2022-12-31 | $5,261 |
| Assets. Other investments not covered elsewhere at end of year | 2022-12-31 | $42,235,612 |
| Assets. Other investments not covered elsewhere at beginning of year | 2022-12-31 | $24,007,480 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2022-12-31 | $15,142,670 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2022-12-31 | $7,128,742 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2022-12-31 | $33,133,757 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2022-12-31 | $44,464,226 |
| Administrative expenses (other) incurred | 2022-12-31 | $81,918 |
| Total non interest bearing cash at end of year | 2022-12-31 | $2,813 |
| Total non interest bearing cash at beginning of year | 2022-12-31 | $0 |
| Value of net income/loss | 2022-12-31 | $-76,574,188 |
| Value of net assets at end of year (total assets less liabilities) | 2022-12-31 | $698,746,349 |
| Value of net assets at beginning of year (total assets less liabilities) | 2022-12-31 | $420,700,747 |
| Interest earned on other investments | 2022-12-31 | $1,362,704 |
| Income. Interest from corporate debt instruments | 2022-12-31 | $22,702,930 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2022-12-31 | $26,083,982 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2022-12-31 | $41,992,153 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2022-12-31 | $41,992,153 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2022-12-31 | $57,430 |
| Asset. Corporate debt instrument preferred debt at end of year | 2022-12-31 | $0 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2022-12-31 | $189,112,059 |
| Asset. Corporate debt instrument debt (other) at end of year | 2022-12-31 | $648,415,029 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2022-12-31 | $202,924,539 |
| Aggregate proceeds on sale of assets | 2022-12-31 | $508,120,568 |
| Aggregate carrying amount (costs) on sale of assets | 2022-12-31 | $509,808,446 |
| 2021 : STATE STREET 3-10 YEAR U.S. CREDIT 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 | $216,130,208 |
| Total transfer of assets from this plan | 2021-12-31 | $87,720,216 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2021-12-31 | $44,464,226 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2021-12-31 | $27,342,236 |
| 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 | $-3,017,033 |
| Total loss/gain on sale of assets | 2021-12-31 | $-1,756,628 |
| Total of all expenses incurred | 2021-12-31 | $37,510 |
| 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 | $465,164,973 |
| Value of total assets at beginning of year | 2021-12-31 | $322,687,534 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2021-12-31 | $37,510 |
| Total interest from all sources | 2021-12-31 | $7,692,764 |
| 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 | $5,141 |
| 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 | $24,007,480 |
| Assets. Other investments not covered elsewhere at beginning of year | 2021-12-31 | $16,753,408 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2021-12-31 | $7,128,742 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2021-12-31 | $5,229,085 |
| 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 | $44,464,226 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2021-12-31 | $27,342,236 |
| Other income not declared elsewhere | 2021-12-31 | $0 |
| Administrative expenses (other) incurred | 2021-12-31 | $32,369 |
| 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 | $-3,054,543 |
| Value of net assets at end of year (total assets less liabilities) | 2021-12-31 | $420,700,747 |
| Value of net assets at beginning of year (total assets less liabilities) | 2021-12-31 | $295,345,298 |
| Investment advisory and management fees | 2021-12-31 | $0 |
| Income. Interest from loans (other than to participants) | 2021-12-31 | $0 |
| Interest earned on other investments | 2021-12-31 | $464,521 |
| Income. Interest from US Government securities | 2021-12-31 | $0 |
| Income. Interest from corporate debt instruments | 2021-12-31 | $7,224,066 |
| 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 | $41,992,153 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2021-12-31 | $26,006,341 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2021-12-31 | $26,006,341 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2021-12-31 | $4,177 |
| 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 | $0 |
| Asset value of US Government securities at beginning of year | 2021-12-31 | $0 |
| 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 | $-8,953,169 |
| 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 | $189,112,059 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2021-12-31 | $130,545,966 |
| Asset. Corporate debt instrument debt (other) at end of year | 2021-12-31 | $202,924,539 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2021-12-31 | $144,152,734 |
| 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 | $142,796,746 |
| Aggregate carrying amount (costs) on sale of assets | 2021-12-31 | $144,553,374 |
| 2020 : STATE STREET 3-10 YEAR U.S. CREDIT INDEX SECURITIES LENDING FUND 2020 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2020-12-31 | $15,291,229 |
| Total unrealized appreciation/depreciation of assets | 2020-12-31 | $15,291,229 |
| Total transfer of assets to this plan | 2020-12-31 | $88,625,588 |
| Total transfer of assets from this plan | 2020-12-31 | $54,565,625 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2020-12-31 | $27,342,236 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2020-12-31 | $18,512,437 |
| Total income from all sources (including contributions) | 2020-12-31 | $20,720,670 |
| Total loss/gain on sale of assets | 2020-12-31 | $-2,303,904 |
| Total of all expenses incurred | 2020-12-31 | $31,795 |
| 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 | $322,687,534 |
| Value of total assets at beginning of year | 2020-12-31 | $259,108,897 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2020-12-31 | $31,795 |
| Total interest from all sources | 2020-12-31 | $7,733,345 |
| Total dividends received (eg from common stock, registered investment company shares) | 2020-12-31 | $0 |
| Administrative expenses professional fees incurred | 2020-12-31 | $4,160 |
| Assets. Other investments not covered elsewhere at end of year | 2020-12-31 | $16,753,408 |
| Assets. Other investments not covered elsewhere at beginning of year | 2020-12-31 | $14,466,876 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2020-12-31 | $5,229,085 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2020-12-31 | $4,959,740 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2020-12-31 | $27,342,236 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2020-12-31 | $18,512,437 |
| Administrative expenses (other) incurred | 2020-12-31 | $27,635 |
| Value of net income/loss | 2020-12-31 | $20,688,875 |
| Value of net assets at end of year (total assets less liabilities) | 2020-12-31 | $295,345,298 |
| Value of net assets at beginning of year (total assets less liabilities) | 2020-12-31 | $240,596,460 |
| Interest earned on other investments | 2020-12-31 | $548,640 |
| Income. Interest from US Government securities | 2020-12-31 | $8 |
| Income. Interest from corporate debt instruments | 2020-12-31 | $7,171,930 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2020-12-31 | $26,006,341 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2020-12-31 | $16,030,137 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2020-12-31 | $16,030,137 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2020-12-31 | $12,767 |
| Asset. Corporate debt instrument preferred debt at end of year | 2020-12-31 | $130,545,966 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2020-12-31 | $108,784,252 |
| Asset. Corporate debt instrument debt (other) at end of year | 2020-12-31 | $144,152,734 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2020-12-31 | $114,867,892 |
| Aggregate proceeds on sale of assets | 2020-12-31 | $193,525,520 |
| Aggregate carrying amount (costs) on sale of assets | 2020-12-31 | $195,829,424 |
| 2019 : STATE STREET 3-10 YEAR U.S. CREDIT INDEX SECURITIES LENDING FUND 2019 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2019-12-31 | $14,524,890 |
| Total unrealized appreciation/depreciation of assets | 2019-12-31 | $14,524,890 |
| Total transfer of assets to this plan | 2019-12-31 | $58,309,316 |
| Total transfer of assets from this plan | 2019-12-31 | $116,304,078 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $18,512,437 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $35,534,922 |
| Total income from all sources (including contributions) | 2019-12-31 | $29,291,324 |
| Total loss/gain on sale of assets | 2019-12-31 | $5,658,843 |
| Total of all expenses incurred | 2019-12-31 | $32,633 |
| 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 | $259,108,897 |
| Value of total assets at beginning of year | 2019-12-31 | $304,867,453 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2019-12-31 | $32,633 |
| Total interest from all sources | 2019-12-31 | $9,107,591 |
| Total dividends received (eg from common stock, registered investment company shares) | 2019-12-31 | $0 |
| Administrative expenses professional fees incurred | 2019-12-31 | $3,643 |
| Assets. Other investments not covered elsewhere at end of year | 2019-12-31 | $14,466,876 |
| Assets. Other investments not covered elsewhere at beginning of year | 2019-12-31 | $15,910,127 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2019-12-31 | $4,959,740 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2019-12-31 | $7,486,783 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2019-12-31 | $18,512,437 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2019-12-31 | $35,534,922 |
| Administrative expenses (other) incurred | 2019-12-31 | $28,990 |
| Value of net income/loss | 2019-12-31 | $29,258,691 |
| Value of net assets at end of year (total assets less liabilities) | 2019-12-31 | $240,596,460 |
| Value of net assets at beginning of year (total assets less liabilities) | 2019-12-31 | $269,332,531 |
| Interest earned on other investments | 2019-12-31 | $86,680 |
| Income. Interest from US Government securities | 2019-12-31 | $534,563 |
| Income. Interest from corporate debt instruments | 2019-12-31 | $8,457,022 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2019-12-31 | $16,030,137 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2019-12-31 | $30,973,663 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2019-12-31 | $30,973,663 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2019-12-31 | $29,326 |
| Asset. Corporate debt instrument preferred debt at end of year | 2019-12-31 | $108,784,252 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2019-12-31 | $127,575,908 |
| Asset. Corporate debt instrument debt (other) at end of year | 2019-12-31 | $114,867,892 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2019-12-31 | $122,920,972 |
| Aggregate proceeds on sale of assets | 2019-12-31 | $163,548,151 |
| Aggregate carrying amount (costs) on sale of assets | 2019-12-31 | $157,889,308 |
| 2018 : STATE STREET 3-10 YEAR U.S. CREDIT INDEX SECURITIES LENDING FUND 2018 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2018-12-31 | $-8,331,959 |
| Total unrealized appreciation/depreciation of assets | 2018-12-31 | $-8,331,959 |
| Total transfer of assets to this plan | 2018-12-31 | $44,411,213 |
| Total transfer of assets from this plan | 2018-12-31 | $55,980,343 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2018-12-31 | $35,534,922 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2018-12-31 | $49,869,209 |
| Total income from all sources (including contributions) | 2018-12-31 | $-1,706,717 |
| Total loss/gain on sale of assets | 2018-12-31 | $-2,568,590 |
| Total of all expenses incurred | 2018-12-31 | $31,651 |
| 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 | $304,867,453 |
| Value of total assets at beginning of year | 2018-12-31 | $332,509,238 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2018-12-31 | $31,651 |
| Total interest from all sources | 2018-12-31 | $9,193,832 |
| Total dividends received (eg from common stock, registered investment company shares) | 2018-12-31 | $0 |
| Administrative expenses professional fees incurred | 2018-12-31 | $4,174 |
| Assets. Other investments not covered elsewhere at end of year | 2018-12-31 | $15,910,127 |
| Assets. Other investments not covered elsewhere at beginning of year | 2018-12-31 | $18,149,619 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2018-12-31 | $7,486,783 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2018-12-31 | $7,331,317 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2018-12-31 | $35,534,922 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2018-12-31 | $49,869,209 |
| Administrative expenses (other) incurred | 2018-12-31 | $27,477 |
| Value of net income/loss | 2018-12-31 | $-1,738,368 |
| Value of net assets at end of year (total assets less liabilities) | 2018-12-31 | $269,332,531 |
| Value of net assets at beginning of year (total assets less liabilities) | 2018-12-31 | $282,640,029 |
| Interest earned on other investments | 2018-12-31 | $658,606 |
| Income. Interest from corporate debt instruments | 2018-12-31 | $8,519,258 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2018-12-31 | $30,973,663 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2018-12-31 | $45,165,897 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2018-12-31 | $45,165,897 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2018-12-31 | $15,968 |
| Asset. Corporate debt instrument preferred debt at end of year | 2018-12-31 | $127,575,908 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2018-12-31 | $132,659,972 |
| Asset. Corporate debt instrument debt (other) at end of year | 2018-12-31 | $122,920,972 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2018-12-31 | $129,202,433 |
| Aggregate proceeds on sale of assets | 2018-12-31 | $149,353,381 |
| Aggregate carrying amount (costs) on sale of assets | 2018-12-31 | $151,921,971 |
| 2017 : STATE STREET 3-10 YEAR U.S. CREDIT 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 | $2,559,650 |
| Total unrealized appreciation/depreciation of assets | 2017-12-31 | $2,559,650 |
| Total transfer of assets to this plan | 2017-12-31 | $400,585,931 |
| Total transfer of assets from this plan | 2017-12-31 | $409,228,330 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2017-12-31 | $49,869,209 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2017-12-31 | $23,083,540 |
| 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 | $13,315,821 |
| Total loss/gain on sale of assets | 2017-12-31 | $924,247 |
| Total of all expenses incurred | 2017-12-31 | $41,487 |
| 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 | $332,509,238 |
| Value of total assets at beginning of year | 2017-12-31 | $301,091,634 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2017-12-31 | $41,487 |
| Total interest from all sources | 2017-12-31 | $9,831,924 |
| 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 | $4,911 |
| Assets. Other investments not covered elsewhere at end of year | 2017-12-31 | $18,149,619 |
| Assets. Other investments not covered elsewhere at beginning of year | 2017-12-31 | $15,572,842 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2017-12-31 | $7,331,317 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2017-12-31 | $5,495,661 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2017-12-31 | $49,869,209 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2017-12-31 | $23,083,540 |
| Other income not declared elsewhere | 2017-12-31 | $0 |
| Administrative expenses (other) incurred | 2017-12-31 | $36,576 |
| Total non interest bearing cash at end of year | 2017-12-31 | $0 |
| Total non interest bearing cash at beginning of year | 2017-12-31 | $7,981 |
| Value of net income/loss | 2017-12-31 | $13,274,334 |
| Value of net assets at end of year (total assets less liabilities) | 2017-12-31 | $282,640,029 |
| Value of net assets at beginning of year (total assets less liabilities) | 2017-12-31 | $278,008,094 |
| 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 | $684,368 |
| Income. Interest from US Government securities | 2017-12-31 | $0 |
| Income. Interest from corporate debt instruments | 2017-12-31 | $9,138,562 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2017-12-31 | $45,165,897 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2017-12-31 | $21,835,115 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2017-12-31 | $21,835,115 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2017-12-31 | $8,994 |
| 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 |
| Asset. Corporate debt instrument preferred debt at end of year | 2017-12-31 | $132,659,972 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2017-12-31 | $134,333,401 |
| Asset. Corporate debt instrument debt (other) at end of year | 2017-12-31 | $129,202,433 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2017-12-31 | $123,846,634 |
| Contract administrator fees | 2017-12-31 | $0 |
| Aggregate proceeds on sale of assets | 2017-12-31 | $193,882,468 |
| Aggregate carrying amount (costs) on sale of assets | 2017-12-31 | $192,958,221 |
| 2016 : STATE STREET 3-10 YEAR U.S. CREDIT INDEX SECURITIES LENDING FUND 2016 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2016-12-31 | $1,420,608 |
| Total unrealized appreciation/depreciation of assets | 2016-12-31 | $1,420,608 |
| Total transfer of assets to this plan | 2016-12-31 | $35,495,928 |
| Total transfer of assets from this plan | 2016-12-31 | $44,557,104 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2016-12-31 | $23,083,540 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2016-12-31 | $28,991,976 |
| Total income from all sources (including contributions) | 2016-12-31 | $12,383,795 |
| Total loss/gain on sale of assets | 2016-12-31 | $1,694,905 |
| Total of all expenses incurred | 2016-12-31 | $39,394 |
| 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 | $301,091,634 |
| Value of total assets at beginning of year | 2016-12-31 | $303,716,845 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2016-12-31 | $39,394 |
| Total interest from all sources | 2016-12-31 | $9,268,282 |
| Total dividends received (eg from common stock, registered investment company shares) | 2016-12-31 | $0 |
| Administrative expenses professional fees incurred | 2016-12-31 | $5,000 |
| Assets. Other investments not covered elsewhere at end of year | 2016-12-31 | $15,572,842 |
| Assets. Other investments not covered elsewhere at beginning of year | 2016-12-31 | $19,400,392 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2016-12-31 | $5,495,661 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2016-12-31 | $9,527,964 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2016-12-31 | $23,083,540 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2016-12-31 | $28,991,976 |
| Administrative expenses (other) incurred | 2016-12-31 | $34,394 |
| Total non interest bearing cash at end of year | 2016-12-31 | $7,981 |
| Total non interest bearing cash at beginning of year | 2016-12-31 | $0 |
| Value of net income/loss | 2016-12-31 | $12,344,401 |
| Value of net assets at end of year (total assets less liabilities) | 2016-12-31 | $278,008,094 |
| Value of net assets at beginning of year (total assets less liabilities) | 2016-12-31 | $274,724,869 |
| Interest earned on other investments | 2016-12-31 | $707,197 |
| Income. Interest from corporate debt instruments | 2016-12-31 | $8,558,917 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2016-12-31 | $21,835,115 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2016-12-31 | $22,350,277 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2016-12-31 | $22,350,277 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2016-12-31 | $2,168 |
| Asset. Corporate debt instrument preferred debt at end of year | 2016-12-31 | $134,333,401 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2016-12-31 | $131,897,911 |
| Asset. Corporate debt instrument debt (other) at end of year | 2016-12-31 | $123,846,634 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2016-12-31 | $120,540,301 |
| Aggregate proceeds on sale of assets | 2016-12-31 | $151,746,921 |
| Aggregate carrying amount (costs) on sale of assets | 2016-12-31 | $150,052,016 |
| 2015 : STATE STREET 3-10 YEAR U.S. CREDIT INDEX SECURITIES LENDING FUND 2015 401k financial data |
|---|
| Unrealized appreciation/depreciation of real estate assets | 2015-12-31 | $0 |
| Unrealized appreciation/depreciation of other (non real estate) assets | 2015-12-31 | $-4,882,018 |
| Total unrealized appreciation/depreciation of assets | 2015-12-31 | $-4,882,018 |
| Total transfer of assets to this plan | 2015-12-31 | $36,683,374 |
| Total transfer of assets from this plan | 2015-12-31 | $111,068,116 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2015-12-31 | $28,991,976 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2015-12-31 | $55,958,335 |
| Total income from all sources (including contributions) | 2015-12-31 | $4,215,175 |
| Total loss/gain on sale of assets | 2015-12-31 | $-1,396,471 |
| Total of all expenses incurred | 2015-12-31 | $41,693 |
| 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 | $303,716,845 |
| Value of total assets at beginning of year | 2015-12-31 | $400,894,464 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2015-12-31 | $41,693 |
| Total interest from all sources | 2015-12-31 | $10,493,664 |
| Total dividends received (eg from common stock, registered investment company shares) | 2015-12-31 | $0 |
| Total dividends received from registered investment company shares (eg mutual funds) | 2015-12-31 | $0 |
| Administrative expenses professional fees incurred | 2015-12-31 | $5,332 |
| Assets. Other investments not covered elsewhere at end of year | 2015-12-31 | $19,400,392 |
| Assets. Other investments not covered elsewhere at beginning of year | 2015-12-31 | $23,990,755 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2015-12-31 | $9,527,964 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2015-12-31 | $16,618,672 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2015-12-31 | $28,991,976 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2015-12-31 | $55,958,335 |
| Administrative expenses (other) incurred | 2015-12-31 | $36,361 |
| Value of net income/loss | 2015-12-31 | $4,173,482 |
| Value of net assets at end of year (total assets less liabilities) | 2015-12-31 | $274,724,869 |
| Value of net assets at beginning of year (total assets less liabilities) | 2015-12-31 | $344,936,129 |
| Investment advisory and management fees | 2015-12-31 | $0 |
| Interest earned on other investments | 2015-12-31 | $878,566 |
| Income. Interest from US Government securities | 2015-12-31 | $0 |
| Income. Interest from corporate debt instruments | 2015-12-31 | $9,609,046 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2015-12-31 | $22,350,277 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2015-12-31 | $43,141,883 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2015-12-31 | $43,141,883 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2015-12-31 | $6,052 |
| Income. Dividends from preferred stock | 2015-12-31 | $0 |
| Income. Dividends from common stock | 2015-12-31 | $0 |
| Asset. Corporate debt instrument preferred debt at end of year | 2015-12-31 | $131,897,911 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2015-12-31 | $187,099,799 |
| Asset. Corporate debt instrument debt (other) at end of year | 2015-12-31 | $120,540,301 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2015-12-31 | $130,043,355 |
| Contract administrator fees | 2015-12-31 | $0 |
| Aggregate proceeds on sale of assets | 2015-12-31 | $163,972,722 |
| Aggregate carrying amount (costs) on sale of assets | 2015-12-31 | $165,369,193 |
| 2014 : STATE STREET 3-10 YEAR U.S. CREDIT INDEX SECURITIES LENDING FUND 2014 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2014-12-31 | $6,619,367 |
| Total unrealized appreciation/depreciation of assets | 2014-12-31 | $6,619,367 |
| Total transfer of assets to this plan | 2014-12-31 | $97,407,095 |
| Total transfer of assets from this plan | 2014-12-31 | $163,072,921 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2014-12-31 | $55,958,335 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2014-12-31 | $55,513,994 |
| Total income from all sources (including contributions) | 2014-12-31 | $20,955,017 |
| Total loss/gain on sale of assets | 2014-12-31 | $948,472 |
| Total of all expenses incurred | 2014-12-31 | $51,414 |
| 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 | $400,894,464 |
| Value of total assets at beginning of year | 2014-12-31 | $445,212,346 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2014-12-31 | $51,414 |
| Total interest from all sources | 2014-12-31 | $13,387,178 |
| Total dividends received (eg from common stock, registered investment company shares) | 2014-12-31 | $0 |
| Administrative expenses professional fees incurred | 2014-12-31 | $6,367 |
| Assets. Other investments not covered elsewhere at end of year | 2014-12-31 | $23,990,755 |
| Assets. Other investments not covered elsewhere at beginning of year | 2014-12-31 | $24,597,659 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2014-12-31 | $16,618,672 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2014-12-31 | $7,886,080 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2014-12-31 | $55,958,335 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2014-12-31 | $55,513,994 |
| Administrative expenses (other) incurred | 2014-12-31 | $45,047 |
| Total non interest bearing cash at end of year | 2014-12-31 | $0 |
| Total non interest bearing cash at beginning of year | 2014-12-31 | $2,821 |
| Value of net income/loss | 2014-12-31 | $20,903,603 |
| Value of net assets at end of year (total assets less liabilities) | 2014-12-31 | $344,936,129 |
| Value of net assets at beginning of year (total assets less liabilities) | 2014-12-31 | $389,698,352 |
| Interest earned on other investments | 2014-12-31 | $969,160 |
| Income. Interest from corporate debt instruments | 2014-12-31 | $12,413,302 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2014-12-31 | $43,141,883 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2014-12-31 | $56,348,126 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2014-12-31 | $56,348,126 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2014-12-31 | $4,716 |
| Asset. Corporate debt instrument preferred debt at end of year | 2014-12-31 | $187,099,799 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2014-12-31 | $217,293,926 |
| Asset. Corporate debt instrument debt (other) at end of year | 2014-12-31 | $130,043,355 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2014-12-31 | $139,083,734 |
| Aggregate proceeds on sale of assets | 2014-12-31 | $165,399,287 |
| Aggregate carrying amount (costs) on sale of assets | 2014-12-31 | $164,450,815 |
| 2013 : STATE STREET 3-10 YEAR U.S. CREDIT INDEX SECURITIES LENDING FUND 2013 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2013-12-31 | $-18,751,600 |
| Total unrealized appreciation/depreciation of assets | 2013-12-31 | $-18,751,600 |
| Total transfer of assets to this plan | 2013-12-31 | $102,328,881 |
| Total transfer of assets from this plan | 2013-12-31 | $155,220,511 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2013-12-31 | $55,513,994 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2013-12-31 | $81,638,295 |
| Total income from all sources (including contributions) | 2013-12-31 | $-4,133,799 |
| Total loss/gain on sale of assets | 2013-12-31 | $-1,988,904 |
| Total of all expenses incurred | 2013-12-31 | $99,757 |
| 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 | $445,212,346 |
| Value of total assets at beginning of year | 2013-12-31 | $528,461,833 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2013-12-31 | $99,757 |
| Total interest from all sources | 2013-12-31 | $16,606,705 |
| Total dividends received (eg from common stock, registered investment company shares) | 2013-12-31 | $0 |
| Administrative expenses professional fees incurred | 2013-12-31 | $7,415 |
| Assets. Other investments not covered elsewhere at end of year | 2013-12-31 | $24,597,659 |
| Assets. Other investments not covered elsewhere at beginning of year | 2013-12-31 | $27,504,627 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2013-12-31 | $7,886,080 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2013-12-31 | $9,342,312 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2013-12-31 | $55,513,994 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2013-12-31 | $81,638,295 |
| Administrative expenses (other) incurred | 2013-12-31 | $92,342 |
| Total non interest bearing cash at end of year | 2013-12-31 | $2,821 |
| Total non interest bearing cash at beginning of year | 2013-12-31 | $0 |
| Value of net income/loss | 2013-12-31 | $-4,233,556 |
| Value of net assets at end of year (total assets less liabilities) | 2013-12-31 | $389,698,352 |
| Value of net assets at beginning of year (total assets less liabilities) | 2013-12-31 | $446,823,538 |
| Interest earned on other investments | 2013-12-31 | $1,171,448 |
| Income. Interest from corporate debt instruments | 2013-12-31 | $15,423,626 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2013-12-31 | $56,348,126 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2013-12-31 | $79,383,961 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2013-12-31 | $79,383,961 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2013-12-31 | $11,631 |
| Asset. Corporate debt instrument preferred debt at end of year | 2013-12-31 | $217,293,926 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2013-12-31 | $257,893,178 |
| Asset. Corporate debt instrument debt (other) at end of year | 2013-12-31 | $139,083,734 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2013-12-31 | $154,337,755 |
| Aggregate proceeds on sale of assets | 2013-12-31 | $198,836,572 |
| Aggregate carrying amount (costs) on sale of assets | 2013-12-31 | $200,825,476 |
| 2012 : STATE STREET 3-10 YEAR U.S. CREDIT INDEX SECURITIES LENDING FUND 2012 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2012-12-31 | $18,315,926 |
| Total unrealized appreciation/depreciation of assets | 2012-12-31 | $18,315,926 |
| Total transfer of assets to this plan | 2012-12-31 | $96,540,523 |
| Total transfer of assets from this plan | 2012-12-31 | $130,206,257 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2012-12-31 | $81,638,295 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2012-12-31 | $66,538,693 |
| Total income from all sources (including contributions) | 2012-12-31 | $43,105,393 |
| Total loss/gain on sale of assets | 2012-12-31 | $6,650,405 |
| Total of all expenses incurred | 2012-12-31 | $111,628 |
| 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 | $528,461,833 |
| Value of total assets at beginning of year | 2012-12-31 | $504,034,200 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2012-12-31 | $111,628 |
| Total interest from all sources | 2012-12-31 | $18,139,062 |
| Total dividends received (eg from common stock, registered investment company shares) | 2012-12-31 | $0 |
| Administrative expenses professional fees incurred | 2012-12-31 | $6,693 |
| Assets. Other investments not covered elsewhere at end of year | 2012-12-31 | $27,504,627 |
| Assets. Other investments not covered elsewhere at beginning of year | 2012-12-31 | $37,835,744 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2012-12-31 | $9,342,312 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2012-12-31 | $7,794,304 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2012-12-31 | $81,638,295 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2012-12-31 | $66,538,693 |
| Administrative expenses (other) incurred | 2012-12-31 | $104,935 |
| Total non interest bearing cash at end of year | 2012-12-31 | $0 |
| Total non interest bearing cash at beginning of year | 2012-12-31 | $3,783 |
| Value of net income/loss | 2012-12-31 | $42,993,765 |
| Value of net assets at end of year (total assets less liabilities) | 2012-12-31 | $446,823,538 |
| Value of net assets at beginning of year (total assets less liabilities) | 2012-12-31 | $437,495,507 |
| Interest earned on other investments | 2012-12-31 | $1,284,628 |
| Income. Interest from corporate debt instruments | 2012-12-31 | $16,849,560 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2012-12-31 | $79,383,961 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2012-12-31 | $64,842,858 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2012-12-31 | $64,842,858 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2012-12-31 | $4,874 |
| Asset. Corporate debt instrument preferred debt at end of year | 2012-12-31 | $257,893,178 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2012-12-31 | $249,629,589 |
| Asset. Corporate debt instrument debt (other) at end of year | 2012-12-31 | $154,337,755 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2012-12-31 | $143,927,922 |
| Aggregate proceeds on sale of assets | 2012-12-31 | $245,172,663 |
| Aggregate carrying amount (costs) on sale of assets | 2012-12-31 | $238,522,258 |
| 2011 : STATE STREET 3-10 YEAR U.S. CREDIT INDEX SECURITIES LENDING FUND 2011 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2011-12-31 | $10,306,424 |
| Total unrealized appreciation/depreciation of assets | 2011-12-31 | $10,306,424 |
| Total transfer of assets to this plan | 2011-12-31 | $79,074,087 |
| Total transfer of assets from this plan | 2011-12-31 | $175,730,726 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2011-12-31 | $66,538,693 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2011-12-31 | $103,261,901 |
| Total income from all sources (including contributions) | 2011-12-31 | $32,763,285 |
| Total loss/gain on sale of assets | 2011-12-31 | $1,111,958 |
| Total of all expenses incurred | 2011-12-31 | $118,315 |
| 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 | $504,034,200 |
| Value of total assets at beginning of year | 2011-12-31 | $604,769,077 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2011-12-31 | $118,315 |
| Total interest from all sources | 2011-12-31 | $21,344,903 |
| Total dividends received (eg from common stock, registered investment company shares) | 2011-12-31 | $0 |
| Administrative expenses professional fees incurred | 2011-12-31 | $7,008 |
| Assets. Other investments not covered elsewhere at end of year | 2011-12-31 | $37,835,744 |
| Assets. Other investments not covered elsewhere at beginning of year | 2011-12-31 | $37,033,665 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2011-12-31 | $7,794,304 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2011-12-31 | $16,292,411 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2011-12-31 | $66,538,693 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2011-12-31 | $103,261,901 |
| Administrative expenses (other) incurred | 2011-12-31 | $111,307 |
| Total non interest bearing cash at end of year | 2011-12-31 | $3,783 |
| Value of net income/loss | 2011-12-31 | $32,644,970 |
| Value of net assets at end of year (total assets less liabilities) | 2011-12-31 | $437,495,507 |
| Value of net assets at beginning of year (total assets less liabilities) | 2011-12-31 | $501,507,176 |
| Interest earned on other investments | 2011-12-31 | $1,693,940 |
| Income. Interest from corporate debt instruments | 2011-12-31 | $19,642,384 |
| 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 | $64,842,858 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2011-12-31 | $101,324,979 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2011-12-31 | $101,324,979 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2011-12-31 | $8,579 |
| Asset value of US Government securities at beginning of year | 2011-12-31 | $701,208 |
| Asset. Corporate debt instrument preferred debt at end of year | 2011-12-31 | $249,629,589 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2011-12-31 | $300,602,143 |
| Asset. Corporate debt instrument debt (other) at end of year | 2011-12-31 | $143,927,922 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2011-12-31 | $148,814,671 |
| Aggregate proceeds on sale of assets | 2011-12-31 | $215,648,578 |
| Aggregate carrying amount (costs) on sale of assets | 2011-12-31 | $214,536,620 |
| 2010 : STATE STREET 3-10 YEAR U.S. CREDIT INDEX SECURITIES LENDING FUND 2010 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2010-12-31 | $38,399,829 |
| Total unrealized appreciation/depreciation of assets | 2010-12-31 | $38,399,829 |
| Total transfer of assets to this plan | 2010-12-31 | $128,260,263 |
| Total transfer of assets from this plan | 2010-12-31 | $730,522,924 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2010-12-31 | $103,261,901 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2010-12-31 | $217,004,015 |
| Total income from all sources (including contributions) | 2010-12-31 | $86,605,184 |
| Total loss/gain on sale of assets | 2010-12-31 | $9,013,821 |
| Total of all expenses incurred | 2010-12-31 | $221,743 |
| 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 | $604,769,077 |
| Value of total assets at beginning of year | 2010-12-31 | $1,234,390,411 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2010-12-31 | $221,743 |
| Total interest from all sources | 2010-12-31 | $39,191,534 |
| Total dividends received (eg from common stock, registered investment company shares) | 2010-12-31 | $0 |
| Administrative expenses professional fees incurred | 2010-12-31 | $19,209 |
| Assets. Other investments not covered elsewhere at end of year | 2010-12-31 | $37,033,665 |
| Assets. Other investments not covered elsewhere at beginning of year | 2010-12-31 | $55,299,670 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2010-12-31 | $16,292,411 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2010-12-31 | $28,763,182 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2010-12-31 | $103,261,901 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2010-12-31 | $217,004,015 |
| Administrative expenses (other) incurred | 2010-12-31 | $202,534 |
| Value of net income/loss | 2010-12-31 | $86,383,441 |
| Value of net assets at end of year (total assets less liabilities) | 2010-12-31 | $501,507,176 |
| Value of net assets at beginning of year (total assets less liabilities) | 2010-12-31 | $1,017,386,396 |
| Interest earned on other investments | 2010-12-31 | $2,763,365 |
| Income. Interest from US Government securities | 2010-12-31 | $13,035 |
| Income. Interest from corporate debt instruments | 2010-12-31 | $36,389,138 |
| 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 | $101,324,979 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2010-12-31 | $216,175,527 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2010-12-31 | $216,175,527 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2010-12-31 | $25,996 |
| Asset value of US Government securities at end of year | 2010-12-31 | $701,208 |
| Asset. Corporate debt instrument preferred debt at end of year | 2010-12-31 | $300,602,143 |
| Asset. Corporate debt instrument preferred debt at beginning of year | 2010-12-31 | $628,706,580 |
| Asset. Corporate debt instrument debt (other) at end of year | 2010-12-31 | $148,814,671 |
| Asset. Corporate debt instrument debt (other) at beginning of year | 2010-12-31 | $305,445,452 |
| Aggregate proceeds on sale of assets | 2010-12-31 | $366,603,177 |
| Aggregate carrying amount (costs) on sale of assets | 2010-12-31 | $357,589,356 |
