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Mortgage Loan Repurchase Losses (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reserve for mortgage loan repurchase losses      
Balance at beginning of period $ 78sti_ReserveForMortgageLoanRepurchaseLosses $ 632sti_ReserveForMortgageLoanRepurchaseLosses $ 320sti_ReserveForMortgageLoanRepurchaseLosses
Repurchase provision 12sti_MortgageRepurchaseReserveProvisionForMortgageLoanRepurchaseLosses 114sti_MortgageRepurchaseReserveProvisionForMortgageLoanRepurchaseLosses 713sti_MortgageRepurchaseReserveProvisionForMortgageLoanRepurchaseLosses
Charge-offs (5)sti_ChargeOffsForMortgageLoanRepurchaseLosses (668)sti_ChargeOffsForMortgageLoanRepurchaseLosses (401)sti_ChargeOffsForMortgageLoanRepurchaseLosses
Balance at end of period $ 85sti_ReserveForMortgageLoanRepurchaseLosses $ 78sti_ReserveForMortgageLoanRepurchaseLosses $ 632sti_ReserveForMortgageLoanRepurchaseLosses