2.2.0.25falsefalse41201 - Disclosure - Variable Interest Entities (Narrative) (Details)truefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $Duration_1_1_2010_To_12_31_2010http://www.sec.gov/CIK0000093751duration2010-01-01T00:00:002010-12-31T00:00:00Unit15Standardhttp://xbrl.us/us-types/2009-01-31sqftxbrlus0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2009 - 12/31/2009 USD ($) USD ($) / shares $Duration_1_1_2009_To_12_31_2009http://www.sec.gov/CIK0000093751duration2009-01-01T00:00:002009-12-31T00:00:00Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit14Divide http://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$5false0stt_VariableInterestEntityFairValueOfCol lateralizedAssetssttfalsedebitinstantVariable Interest Entity Fair Value Of Collateralized Assetsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse28500000002850000000falsetruefalsefalsefalse2truefalsefalse31300000003130000000falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryVariable Interest Entity Fair Value Of Collateralized Assets No authoritative reference available.falsefalse6false0us-gaap_VariableInterestEntityCarryingAmountOfCollateralizedAssetsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse25000000002500000000falsefalsefalsefalsefalse2truefalsefalse27400000002740000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe carrying amount of the variable interest entity's assets consolidated into the statement of financial position. In general, a VIE is a corporation, partnership, trust, or any other legal structure used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors that do not provide sufficient financial resources for the entity to support its activities. A VIE often holds financial assets, including loans or receivables, real estate or other property. A VIE may be essentially passive or it may engage in research and development or other activities on behalf of another company.Reference 1: http://www.xbrl.org/2003/role/presentat ionRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 26 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph 9 -Subparagraph c(5), c(6) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 23 -Subparagraph a Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph C5 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 23 -Subparagraph b Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 24 -Subparagraph b Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph C8 -Subparagraph b falsefalse7false0stt_WeightedAverageLifeOfTrustssttfalsenainstantWeighted-average life of trusts.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse7.77.7falsefalsefalsefalsefalse2truefalsefalse8.18.1falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalWeighted-average life of trusts.No authoritative reference available.falsefalse8false0stt_TotalStandbyBondPurchaseAgreementCommitedToTrustssttfalsedebitinstantTotal standby bond purchase agreement committed to trusts.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse28000000002800000000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryTotal standby bond purchase agreement committed to trusts.No authoritative reference available.falsefalse9false0stt_AggregateNotionalValueOfTheseCDOssttfalsedebitinstantAggregate notional value of CDOs.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse10000000001000000000falsefalsefalsefalsefalse2truefalsefalse20000000002000000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate notional value of CDOs.No authoritative reference available.falsefalse10 false0stt_CarryingValueOfUnderlyingCollateralsttfalsedebitinstantCarrying value of the underlying collateral.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse323000000323000000falsefalsefalsefalsefalse2truefalsefalse12000000001200000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying value of the underlying collateral.No authoritative reference available.falsefalse11false0stt_VoluntaryRedemptionOfFirstLossNotessttfalsecreditinstantVoluntary redemption of the first-loss notesfalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse6700000067000000falsefalsefalsefalsefalse2falsefalsefalse00falsefalse falsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryVoluntary redemption of the first-loss notesNo authoritative reference available.falsefalse12false0stt_PreTaxExtraordinaryLosssttfalsecreditdurationPre-tax extraordinary lossfalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse61000000006100000000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryPre-tax extraordinary lossNo authoritative reference available.falsefalse13false0stt_AfterTaxExtraordinaryLosssttfalsecreditinstantAfter tax extraordinary lossfalsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse36800000003680000000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAfter tax extraordinary lossNo authoritative reference available.falsefalse15false< /IsAbstractGroupTitle>0us-gaap_AccretionExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse712000000712000000falsetruefalsefalsefalse2truefalsefalse621000000621000000falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAmount recognized for the passage of t ime, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 146 -Paragraph 6 falsefalse210Variable Interest Entities (Narrative) (Details) (USD $)NoRoundingUnKnownUnKnownUnKnowntruetrue