2.2.0.25falsefalse40801 - Disclosure - Commitments and Contingencies (Narrative) (Details)truefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011
USD ($)
USD ($) / shares
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USD ($)
$Duration_7_1_2010_To_9_30_2010http://www.sec.gov/CIK0000093751duration2010-07-01T00:00:002010-09-30T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3falsefalseUSDfalsefalse7/1/2007 - 9/30/2007
Duration_7_1_2007_To_9_30_2007http://www.sec.gov/CIK0000093751duration2007-07-01T00:00:002007-09-30T00:00:00Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170$4falsefalsefalsefalse1/1/2007 - 12/31/2007
Duration_1_1_2007_To_12_31_2007http://www.sec.gov/CIK0000093751duration2007-01-01T00:00:002007-12-31T00:00:005falsefalseUSDfalsefalse1/1/2001 - 12/31/2007
USD ($)
$Duration_1_1_2001_To_12_31_2007http://www.sec.gov/CIK0000093751duration2001-01-01T00:00:002007-12-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6falsefalseEURfalsefalse3/31/2011
EUR (€)
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USD ($)
USD ($) / shares
$As_Of_12_31_2010http://www.sec.gov/CIK0000093751instant2010-12-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit15Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$8falsefalseUSDfalsefalse8/31/2009
USD ($)
$As_Of_8_31_2009http://www.sec.gov/CIK0000093751instant2009-08-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$9falsefalseUSDfalsefalse9/15/2008
USD ($)
$As_Of_9_15_2008http://www.sec.gov/CIK0000093751instant2008-09-15T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit14Standardhttp://www.statestreet.com/2011-03-31Cusstt0USDUSD$10falsefalseUSDfalsefalse6/30/2007
USD ($)
$As_Of_6_30_2007http://www.sec.gov/CIK0000093751instant2007-06-30T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2true0stt_CommitmentsAndContingenciesAbstractsttfalsenadurationCommitments and contingencies.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringCommitments and contingencies.falsefalse3false0stt_PercentOfFairMarketValueThatMustBeMaintainedInCollateralsttfalsenadurationPercent of fair market value that must be maintained in collateralfalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truetruefalse11falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalse4falsetruefalse00falsefalsefalsefalsefalse5falsetruefalse00falsefalsefalsefalsefalse6falsetruefalse00falsefalsefalsefalsefalse7falsetruefalse00falsefalsefalsefalsefalse8falsetruefalse00falsefalsefalsefalsefalse9falsetruefalse00falsefalsefalsefalsefalse10falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepurePercent of fair market value that must be maintained in collateralNo authoritative reference available.falsefalse4false0stt_NetAssetsOfRegisteredSubPrimeFundssttfalsedebitinstantNet assets of registered sub-prime fundsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10truefalsefalse300000000300000000falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNet assets of registered sub-prime fundsNo authoritative reference available.falsefalse5false0stt_AverageDeclineInNetAssetValuePerSharesttfalsenadurationAverage decline in net asset value per share.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3truetruefalse0.07230.0723falsefalsefalsefalsefalse4falsetruefalse00falsefalsefalsefalsefalse5falsetruefalse00falsefalsefalsefalsefalse6falsetruefalse00falsefalsefalsefalsefalse7falsetruefalse00falsefalsefalsefalsefalse8falsetruefalse00falsefalsefalsefalsefalse9falsetruefalse00falsefalsefalsefalsefalse10falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureAverage decline in net asset value per share.No authoritative reference available.falsefalse6false0stt_ActualDamagesAssertedByAttorneyGeneralsttfalsecreditdurationActual Damages Asserted By Attorney Generalfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5truefalsefalse5600000056000000falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryActual Damages Asserted By Attorney GeneralNo authoritative reference available.falsefalse7false0us-gaap_LitigationReserveus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7truefalsefalse7500000075000000falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.No authoritative reference available.falsefalse8false0us-gaap_LitigationSettlementGrossus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse1200000012000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis element represents the gross amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period.No authoritative reference available.falsefalse9false0stt_NumberOfYearsOfRelationshipsWithStateOfWashingtonsttfalsenadurationNumber of Years of Relationships with State of Washingtonfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00tentenfalsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNumber of Years of Relationships with State of WashingtonNo authoritative reference available.falsefalse10false0stt_NetAssetsOfFundHeldByBankruptCounterpartysttfalsedebitinstantNet Assets of Fund Held By Bankrupt Counterpartyfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse312000000312000000falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNet Assets of Fund Held By Bankrupt CounterpartyNo authoritative reference available.falsefalse11false0stt_NumberOfCustomersNotInSettlementAgreementssttfalsenainstantNumber Of Customers Not In Settlement Agreementsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse55falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:integerItemTypeintegerNumber Of Customers Not In Settlement AgreementsNo authoritative reference available.falsefalse12false0stt_SettlementsWithDutchCustomerssttfalsedebitinstantSettlements with Dutch customers.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6truefalsefalse4200000042000000falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySettlements with Dutch customers.No authoritative reference available.falsefalse13false0stt_InvestmentsInFundsByCustomersNotSettledsttfalsedebitinstantCost of the investment.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse170000000170000000falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCost of the investment.No authoritative reference available.falsefalse14false0us-gaap_UnrecognizedTaxBenefitsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse271000000271000000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7truefalsefalse419000000419000000falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe gross amount of unrecognized tax benefits (tax reductions recognized in financial reports but excluded from tax returns) pertaining to uncertain tax positions taken in tax returns as of the beginning balance sheet date, excluding amounts pertaining to examined tax returns.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
-Subparagraph a
falsefalse15false0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthoritiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse185000000185000000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 21
-Subparagraph a(3)
falsefalse16false0invest_DerivativeNotionalAmountinvestfalsenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse4492000000044920000000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7truefalsefalse4676000000046760000000falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal monetary amount specified by the derivative(s). Expressed as an absolute value.No authoritative reference available.falsefalse17false0stt_LossContingencyDamagesSoughtByPlaintiffssttfalsedebitinstantLoss Contingency Damages Sought By Plaintiffsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8truefalsefalse120000000120000000falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryLoss Contingency Damages Sought By PlaintiffsNo authoritative reference available.falsefalse18false0stt_DifferenceBetweenAmortizedCostAndMarketValueOfInKindDistributionsttfalsedebitinstantDifference Between Amortized Cost And Market Value Of In Kind Distributionfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse4900000049000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryDifference Between Amortized Cost And Market Value Of In Kind DistributionNo authoritative reference available.falsefalse19false0us-gaap_CashCollateralForBorrowedSecuritiesus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7truefalsefalse330000000330000000falsetruefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 2
-Article 7
falsefalse1018Commitments and Contingencies (Narrative) (Details)NoRoundingUnKnownUnKnownUnKnowntruetrue