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USD ($)
USD ($) / shares
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USD ($)
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1/1/2011 - 3/31/2011
USD ($)
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12/31/2010
USD ($)
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-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-Subparagraph c
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 20
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Paragraph 8
-Subparagraph j(ii)
-Subsection I
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 15
-Paragraph 40
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1/1/2011 - 3/31/2011
USD ($)
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12/31/2010
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-Subparagraph c
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1/1/2011 - 3/31/2011
USD ($)
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{us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis} : CRE - Other - Acquired Credit-Impaired [Member]
12/31/2010
USD ($)
$As_Of_12_31_2010_us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis_stt_CreOtherAcquiredCreditImpairedMember_us-gaap_ValuationAllowancesAndReservesTypeAxis_stt_WithNoRelatedAllowanceRecordedMemberhttp://www.sec.gov/CIK0000093751instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseWith No Related Allowance Recorded [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_WithNoRelatedAllowanceRecordedMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberfalsefalseCRE - Other - Acquired Credit-Impaired [Member]us-gaap_GuarantorObligationsByUnderlyingAssetClassAxisxbrldihttp://xbrl.org/2006/xbrldistt_CreOtherAcquiredCreditImpairedMemberus-gaap_GuarantorObligationsByUnderlyingAssetClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse12false0stt_ImpairedLoansRecordedPrincipalBalancesttfalsedebitinstantImpaired Loans Recorded Principal Balancefalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1500000015falsefalsefalsefalsefalse2truefalsefalse1600000016falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryImpaired Loans Recorded Principal BalanceNo authoritative reference available.falsefalse13false0stt_ImpairedLoansOfUnpaidPrincipalBalancesttfalsedebitinstantImpaired Loans Of Unpaid Principal Balancefalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse4800000048falsefalsefalsefalsefalse2truefalsefalse4700000047falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryImpaired Loans Of Unpaid Principal BalanceNo authoritative reference available.falsefalse14false0us-gaap_LoansAndLeasesReceivableImpairedAverageInvestmentus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1600000016falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects the average recorded investment in impaired loans during each period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-Subparagraph c
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{us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis} : CRE - Other [Member]
1/1/2011 - 3/31/2011
USD ($)
$Duration_1_1_2011_To_3_31_2011_us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis_stt_CreOtherMember_us-gaap_ValuationAllowancesAndReservesTypeAxis_stt_WithNoRelatedAllowanceRecordedMemberhttp://www.sec.gov/CIK0000093751duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseWith No Related Allowance Recorded [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_WithNoRelatedAllowanceRecordedMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberfalsefalseCRE - Other [Member]us-gaap_GuarantorObligationsByUnderlyingAssetClassAxisxbrldihttp://xbrl.org/2006/xbrldistt_CreOtherMemberus-gaap_GuarantorObligationsByUnderlyingAssetClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$10falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : With No Related Allowance Recorded [Member]
{us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis} : CRE - Other [Member]
12/31/2010
USD ($)
$As_Of_12_31_2010_us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis_stt_CreOtherMember_us-gaap_ValuationAllowancesAndReservesTypeAxis_stt_WithNoRelatedAllowanceRecordedMemberhttp://www.sec.gov/CIK0000093751instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseWith No Related Allowance Recorded [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_WithNoRelatedAllowanceRecordedMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberfalsefalseCRE - Other [Member]us-gaap_GuarantorObligationsByUnderlyingAssetClassAxisxbrldihttp://xbrl.org/2006/xbrldistt_CreOtherMemberus-gaap_GuarantorObligationsByUnderlyingAssetClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse16false0stt_ImpairedLoansRecordedPrincipalBalancesttfalsedebitinstantImpaired Loans Recorded Principal Balancefalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1200000012falsefalsefalsefalsefalse2truefalsefalse2700000027falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryImpaired Loans Recorded Principal BalanceNo authoritative reference available.falsefalse17false0stt_ImpairedLoansOfUnpaidPrincipalBalancesttfalsedebitinstantImpaired Loans Of Unpaid Principal Balancefalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1400000014falsefalsefalsefalsefalse2truefalsefalse2900000029falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryImpaired Loans Of Unpaid Principal BalanceNo authoritative reference available.falsefalse18false0us-gaap_LoansAndLeasesReceivableImpairedAverageInvestmentus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1400000014falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects the average recorded investment in impaired loans during each period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-Subparagraph c
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Paragraph 8
-Subparagraph j(ii)
-Subsection I
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 15
-Paragraph 40
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{us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis} : CRE - Property Development [Member]
1/1/2011 - 3/31/2011
USD ($)
$Duration_1_1_2011_To_3_31_2011_us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis_stt_CrePropertyDevelopmentMember_us-gaap_ValuationAllowancesAndReservesTypeAxis_stt_WithAllowanceRecordedMemberhttp://www.sec.gov/CIK0000093751duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseWith an Allowance Recorded [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_WithAllowanceRecordedMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberfalsefalseCRE - Property Development [Member]us-gaap_GuarantorObligationsByUnderlyingAssetClassAxisxbrldihttp://xbrl.org/2006/xbrldistt_CrePropertyDevelopmentMemberus-gaap_GuarantorObligationsByUnderlyingAssetClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$12falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : With an Allowance Recorded [Member]
{us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis} : CRE - Property Development [Member]
12/31/2010
USD ($)
$As_Of_12_31_2010_us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis_stt_CrePropertyDevelopmentMember_us-gaap_ValuationAllowancesAndReservesTypeAxis_stt_WithAllowanceRecordedMemberhttp://www.sec.gov/CIK0000093751instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseWith an Allowance Recorded [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_WithAllowanceRecordedMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberfalsefalseCRE - Property Development [Member]us-gaap_GuarantorObligationsByUnderlyingAssetClassAxisxbrldihttp://xbrl.org/2006/xbrldistt_CrePropertyDevelopmentMemberus-gaap_GuarantorObligationsByUnderlyingAssetClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse21false0stt_ImpairedLoansRecordedPrincipalBalancesttfalsedebitinstantImpaired Loans Recorded Principal Balancefalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse8000000080falsefalsefalsefalsefalse2truefalsefalse7900000079falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryImpaired Loans Recorded Principal BalanceNo authoritative reference available.falsefalse22false0stt_ImpairedLoansOfUnpaidPrincipalBalancesttfalsedebitinstantImpaired Loans Of Unpaid Principal Balancefalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse116000000116falsefalsefalsefalsefalse2truefalsefalse113000000113falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryImpaired Loans Of Unpaid Principal BalanceNo authoritative reference available.falsefalse23false0us-gaap_LoansAndLeasesReceivableImpairedAllowanceForLoanLossesus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse2400000024falsefalsefalsefalsefalse2truefalsefalse2400000024[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects amount of allowance for credit losses pertaining to impaired loans.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-Subparagraph a
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Paragraph 8
-Subparagraph j(ii)
-Subsection I
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-Subparagraph c
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{us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis} : CRE - Property Development - Acquired Credit-Impaired [Member]
1/1/2011 - 3/31/2011
USD ($)
$Duration_1_1_2011_To_3_31_2011_us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis_stt_CrePropertyDevelopmentAcquiredCreditImpairedMember_us-gaap_ValuationAllowancesAndReservesTypeAxis_stt_WithAllowanceRecordedMemberhttp://www.sec.gov/CIK0000093751duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseWith an Allowance Recorded [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_WithAllowanceRecordedMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberfalsefalseCRE - Property Development - Acquired Credit-Impaired [Member]us-gaap_GuarantorObligationsByUnderlyingAssetClassAxisxbrldihttp://xbrl.org/2006/xbrldistt_CrePropertyDevelopmentAcquiredCreditImpairedMemberus-gaap_GuarantorObligationsByUnderlyingAssetClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$14falsefalseUSDtruefalse{us-gaap_ValuationAllowancesAndReservesTypeAxis} : With an Allowance Recorded [Member]
{us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis} : CRE - Property Development - Acquired Credit-Impaired [Member]
12/31/2010
USD ($)
$As_Of_12_31_2010_us-gaap_GuarantorObligationsByUnderlyingAssetClassAxis_stt_CrePropertyDevelopmentAcquiredCreditImpairedMember_us-gaap_ValuationAllowancesAndReservesTypeAxis_stt_WithAllowanceRecordedMemberhttp://www.sec.gov/CIK0000093751instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseWith an Allowance Recorded [Member]us-gaap_ValuationAllowancesAndReservesTypeAxisxbrldihttp://xbrl.org/2006/xbrldistt_WithAllowanceRecordedMemberus-gaap_ValuationAllowancesAndReservesTypeAxisexplicitMemberfalsefalseCRE - Property Development - Acquired Credit-Impaired [Member]us-gaap_GuarantorObligationsByUnderlyingAssetClassAxisxbrldihttp://xbrl.org/2006/xbrldistt_CrePropertyDevelopmentAcquiredCreditImpairedMemberus-gaap_GuarantorObligationsByUnderlyingAssetClassAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalse26false0stt_ImpairedLoansRecordedPrincipalBalancesttfalsedebitinstantImpaired Loans Recorded Principal Balancefalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse4200000042falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryImpaired Loans Recorded Principal BalanceNo authoritative reference available.falsefalse27false0stt_ImpairedLoansOfUnpaidPrincipalBalancesttfalsedebitinstantImpaired Loans Of Unpaid Principal Balancefalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse4700000047falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryImpaired Loans Of Unpaid Principal BalanceNo authoritative reference available.falsefalse28false0us-gaap_LoansAndLeasesReceivableImpairedAllowanceForLoanLossesus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse1900000019[1]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects amount of allowance for credit losses pertaining to impaired loans.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-Subparagraph a
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Paragraph 8
-Subparagraph j(ii)
-Subsection I
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-Subparagraph c
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USD ($)
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12/31/2010
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-Subparagraph a
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Paragraph 8
-Subparagraph j(ii)
-Subsection I
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-Subparagraph c
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USD ($)
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12/31/2010
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-Subparagraph c
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USD ($)
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12/31/2010
USD ($)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-Subparagraph a
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Paragraph 8
-Subparagraph j(ii)
-Subsection I
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-Subparagraph c
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Paragraph 8
-Subparagraph j(ii)
-Subsection I
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 15
-Paragraph 40
falsefalse1
(1)
As of both March 31, 2011 and December 31, 2010, there was an additional allowance for loan losses of $31 million associated with loans and leases that were not impaired. 243Loans and Leases (Impaired Loans) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue