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Certain Transfers of Financial Assets and Variable Interest Entities - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other $ 21,000,000us-gaap_CashFlowsBetweenTransfereeAndTransferorReceiptsOnInterestsThatContinueToBeHeldOther $ 36,000,000us-gaap_CashFlowsBetweenTransfereeAndTransferorReceiptsOnInterestsThatContinueToBeHeldOther $ 30,000,000us-gaap_CashFlowsBetweenTransfereeAndTransferorReceiptsOnInterestsThatContinueToBeHeldOther
Total assets 190,328,000,000us-gaap_Assets 175,335,000,000us-gaap_Assets  
Loans Receivable Held-for-sale, Net 3,232,000,000us-gaap_LoansReceivableHeldForSaleNet [1],[2] 1,699,000,000us-gaap_LoansReceivableHeldForSaleNet [1]  
Long-term Debt 13,022,000,000us-gaap_LongTermDebt [3] 10,700,000,000us-gaap_LongTermDebt [3]  
Total liabilities 167,323,000,000us-gaap_Liabilities 153,913,000,000us-gaap_Liabilities  
LHFS excluded from managed loans disclosure 3,200,000,000sti_LhfsExcludedFromManagedLoansDisclosure 1,700,000,000sti_LhfsExcludedFromManagedLoansDisclosure  
Trading assets 6,202,000,000us-gaap_TradingSecurities [4] 5,040,000,000us-gaap_TradingSecurities [4]  
Derivative Asset, Fair Value, Gross Asset 5,839,000,000us-gaap_DerivativeFairValueOfDerivativeAsset 6,125,000,000us-gaap_DerivativeFairValueOfDerivativeAsset  
Derivative Liability, Fair Value, Gross Liability 5,577,000,000us-gaap_DerivativeFairValueOfDerivativeLiability 5,673,000,000us-gaap_DerivativeFairValueOfDerivativeLiability  
Other Assets 5,656,000,000us-gaap_OtherAssets 5,690,000,000us-gaap_OtherAssets  
Investment Tax Credit 66,000,000us-gaap_IncomeTaxCreditsAndAdjustments 64,000,000us-gaap_IncomeTaxCreditsAndAdjustments 63,000,000us-gaap_IncomeTaxCreditsAndAdjustments
Affordable Housing Investment [Member]      
Real Estate Held for Development and Sale 79,000,000us-gaap_RealEstateHeldForDevelopmentAndSale
/ us-gaap_InvestmentTypeAxis
= sti_AffordableHousingInvestmentMember		    
Variable Interest Entity, Primary Beneficiary [Member]      
Loans Receivable Held-for-sale, Net 0us-gaap_LoansReceivableHeldForSaleNet
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 261,000,000us-gaap_LoansReceivableHeldForSaleNet
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		  
Long-term Debt 302,000,000us-gaap_LongTermDebt
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 597,000,000us-gaap_LongTermDebt
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		  
Residential Mortgage [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Loans and Leases Receivable, Gain (Loss) on Sales, Net 224,000,000us-gaap_LoansAndLeasesReceivableGainLossOnSalesNet
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 186,000,000us-gaap_LoansAndLeasesReceivableGainLossOnSalesNet
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 1,000,000,000us-gaap_LoansAndLeasesReceivableGainLossOnSalesNet
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Transferor's Interests in Transferred Financial Assets, Fair Value 55,000,000us-gaap_InterestsContinuedToBeHeldByTransferorFairValue
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 71,000,000us-gaap_InterestsContinuedToBeHeldByTransferorFairValue
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Total assets 288,000,000us-gaap_Assets
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 350,000,000us-gaap_Assets
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Commercial and Corporate Loans [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Total assets 704,000,000us-gaap_Assets
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommercialAndCorporateLoansMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 1,600,000,000us-gaap_Assets
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommercialAndCorporateLoansMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Total liabilities 654,000,000us-gaap_Liabilities
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommercialAndCorporateLoansMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 1,600,000,000us-gaap_Liabilities
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommercialAndCorporateLoansMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Commercial and Corporate Loans [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Preference Shares [Member]      
Total assets 3,000,000us-gaap_Assets
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommercialAndCorporateLoansMember
/ us-gaap_InvestmentTypeAxis
= sti_PreferenceSharesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 3,000,000us-gaap_Assets
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommercialAndCorporateLoansMember
/ us-gaap_InvestmentTypeAxis
= sti_PreferenceSharesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Commercial and Corporate Loans [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Senior Subordinated Notes [Member]      
Total assets 18,000,000us-gaap_Assets
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommercialAndCorporateLoansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 26,000,000us-gaap_Assets
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommercialAndCorporateLoansMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Commercial and Corporate Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Long-term Debt   256,000,000us-gaap_LongTermDebt
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommercialAndCorporateLoansMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		  
Student Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Long-term Debt 302,000,000us-gaap_LongTermDebt
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_StudentLoansMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 341,000,000us-gaap_LongTermDebt
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_StudentLoansMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		  
Loans Receivable, Net 306,000,000us-gaap_LoansReceivableNet
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_StudentLoansMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 344,000,000us-gaap_LoansReceivableNet
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_StudentLoansMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		  
Student Loans [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Maximum [Member]      
Government guaranteed percent 97.00%sti_GovernmentGuaranteePercent
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_StudentLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 97.00%sti_GovernmentGuaranteePercent
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_StudentLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		  
Total Return Swap | Variable Interest Entity, Not Primary Beneficiary [Member]      
Trading assets 2,300,000,000us-gaap_TradingSecurities
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_TotalReturnSwapMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 1,500,000,000us-gaap_TradingSecurities
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_TotalReturnSwapMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Derivative, Notional Amount 2,300,000,000invest_DerivativeNotionalAmount
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_TotalReturnSwapMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 1,500,000,000invest_DerivativeNotionalAmount
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_TotalReturnSwapMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Derivative Asset, Fair Value, Gross Asset 19,000,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_TotalReturnSwapMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 35,000,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_TotalReturnSwapMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Derivative Liability, Fair Value, Gross Liability 14,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_TotalReturnSwapMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 31,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_TotalReturnSwapMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Community Development Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Total assets 1,600,000,000us-gaap_Assets
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommunityDevelopmentInvestmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 1,500,000,000us-gaap_Assets
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommunityDevelopmentInvestmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 236,000,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommunityDevelopmentInvestmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 217,000,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommunityDevelopmentInvestmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Real Estate Variable Interest Entity Borrowings 113,000,000us-gaap_RealEstateVariableInterestEntityBorrowings
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommunityDevelopmentInvestmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 138,000,000us-gaap_RealEstateVariableInterestEntityBorrowings
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommunityDevelopmentInvestmentsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Limited Partner [Member] | Community Development Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Other Assets 363,000,000us-gaap_OtherAssets
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommunityDevelopmentInvestmentsMember
/ sti_InvestmentsByTierAxis
= us-gaap_LimitedPartnerMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 252,000,000us-gaap_OtherAssets
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommunityDevelopmentInvestmentsMember
/ sti_InvestmentsByTierAxis
= us-gaap_LimitedPartnerMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 910,000,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommunityDevelopmentInvestmentsMember
/ sti_InvestmentsByTierAxis
= us-gaap_LimitedPartnerMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 697,000,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommunityDevelopmentInvestmentsMember
/ sti_InvestmentsByTierAxis
= us-gaap_LimitedPartnerMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
Loans issued by the Company to the limited partnerships 412,000,000sti_LoansInterestRateSwapsorLettersofCreditToLimitedPartnership
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommunityDevelopmentInvestmentsMember
/ sti_InvestmentsByTierAxis
= us-gaap_LimitedPartnerMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 303,000,000sti_LoansInterestRateSwapsorLettersofCreditToLimitedPartnership
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= sti_CommunityDevelopmentInvestmentsMember
/ sti_InvestmentsByTierAxis
= us-gaap_LimitedPartnerMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		  
provision for income taxes [Member]      
Other Depreciation and Amortization $ 61,000,000us-gaap_OtherDepreciationAndAmortization
/ sti_CurrentOrDeferredIncomeTaxExpenseAxis
= sti_ProvisionForIncomeTaxesMember		 $ 49,000,000us-gaap_OtherDepreciationAndAmortization
/ sti_CurrentOrDeferredIncomeTaxExpenseAxis
= sti_ProvisionForIncomeTaxesMember		 $ 39,000,000us-gaap_OtherDepreciationAndAmortization
/ sti_CurrentOrDeferredIncomeTaxExpenseAxis
= sti_ProvisionForIncomeTaxesMember
[1] Includes debt of consolidated VIEs of $302 million and $597 million at December 31, 2014 and December 31, 2013, respectively, of which $0 million and $256 million are carried at fair value at December 31, 2014 and December 31, 2013, respectively.
[2] Includes $1.9 billion and $1.4 billion of LHFS carried at fair value at December 31, 2014 and 2013, respectively.
[3] Includes restricted shares of 2,930 thousand and 3,984 thousand at December 31, 2014 and December 31, 2013, respectively.
[4] Includes loans held for sale, at fair value, of consolidated VIEs of $0 million and $261 million at December 31, 2014 and December 31, 2013, respectively.