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Guarantees Repurchased Mortgage Loan (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Repurchased mortgage loans, carrying value $ 299sti_RepurchasedMortgageLoansCarryingValue $ 312sti_RepurchasedMortgageLoansCarryingValue
Loans Held For Investment [Member]    
Repurchased mortgage loans, carrying value 270sti_RepurchasedMortgageLoansCarryingValue
/ us-gaap_UnderlyingAssetClassAxis
= sti_LoansHeldForInvestmentMember		 271sti_RepurchasedMortgageLoansCarryingValue
/ us-gaap_UnderlyingAssetClassAxis
= sti_LoansHeldForInvestmentMember
Nonperforming Financing Receivable [Member] | Loans Held For Investment [Member]    
Repurchased mortgage loans, carrying value 29sti_RepurchasedMortgageLoansCarryingValue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_UnderlyingAssetClassAxis
= sti_LoansHeldForInvestmentMember		 29sti_RepurchasedMortgageLoansCarryingValue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_UnderlyingAssetClassAxis
= sti_LoansHeldForInvestmentMember
Nonperforming Financing Receivable [Member] | Residential Mortgage, Loans Held For Sale [Member]    
Repurchased mortgage loans, carrying value $ 0sti_RepurchasedMortgageLoansCarryingValue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_UnderlyingAssetClassAxis
= sti_ResidentialMortgageLoansHeldForSaleMember		 $ 12sti_RepurchasedMortgageLoansCarryingValue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_UnderlyingAssetClassAxis
= sti_ResidentialMortgageLoansHeldForSaleMember