2.2.0.25falsefalse41103 - Disclosure - Commitments and Contingencies (Schedule of Repurchase Agreements) (Details)truefalseIn Millionsfalse1falsefalseUSDfalsefalse12/31/2010
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/instancesharesxbrli0Unit14Divide
http://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2falsefalseUSDfalsefalse12/31/2009
USD ($)
USD ($) / shares
$As_Of_12_31_2009http://www.sec.gov/CIK0000093751instant2009-12-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit14Divide
http://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$5false0stt_AggregateFairValueOfIndemnifiedSecuritiesOnLoansttfalsedebitinstantAggregate Fair Value Of Indemnified Securities On Loanfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse334235000000334235[1]falsetruefalsefalsefalse2truefalsefalse365251000000365251[1]falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate Fair Value Of Indemnified Securities On LoanN
o authoritative reference available.falsefalse6false0stt_AggregateFairValueOfCashAndSecuritiesHeldAsCollateralForIndemnifiedSecuritiessttfalsedebitinstantAggregate Fair Value Of Cash And Securities Held As Collateral For Indemnified Securitiesfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse343410000000343410falsefalsefalsefalsefalse2truefalsefalse375916000000375916falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate Fair Value Of Cash And Securities Held As Collateral For Indemnified SecuritiesNo authoritative reference available.falsefalse7false0stt_CollateralForIndemnifiedSecuritiesInvestedInIndemnifiedRepurchaseAgreementssttfalsecreditinstantCollateral for
Indemnified Securities Invested in Indemnified Repurchase Agreementsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse8906900000089069falsefalsefalsefalsefalse2truefalsefalse7772600000077726falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCollateral for Indemnified Securities Invested in Indemnified Repurchase AgreementsNo authoritative reference available.falsefalse8false0stt_AggregateFairValueOfCashAndSecuritiesHeldAsCollateralForIndemnifiedRepurchaseAgreementssttfalsedebitinstantAggregate Fair Value Of Cash And Securities Held As Collateral For Indemnified Repurchase Agreementsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse9329400000093294falsetruefalsefalsefalse2truefalsefalse8262200000082622falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate Fair Value Of Cash And Securities Held As Collateral For Indemnified Repurchase AgreementsNo authoritative reference available.falsefalse1
Related collateral and other information is provided in the following "Securities Finance" section. 24Commitments and Contingencies (Schedule of Repurchase Agreements) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
