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Schedule of Aggregate Maturities of Long-Term Debt Obligations (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Contractually obligated payments for long-term debt due in 2015 $ 702us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
Contractually obligated payments for long-term debt due in 2016 4,018us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
Contractually obligated payments for long-term debt due in 2017 2,481us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
Contractually obligated payments for long-term debt due in 2018 1,951us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
Contractually obligated payments for long-term debt due in 2019 1,698us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Thereafter 4,117us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Total 14,967us-gaap_LongTermDebt [1] 9,633us-gaap_LongTermDebt [1]
Parent Company Only    
Debt Instrument [Line Items]    
Contractually obligated payments for long-term debt due in 2016 1,250us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Contractually obligated payments for long-term debt due in 2017 539us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Contractually obligated payments for long-term debt due in 2018 544us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Contractually obligated payments for long-term debt due in 2019 499us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Thereafter 2,562us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Total 5,394us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 4,757us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Subsidiaries    
Debt Instrument [Line Items]    
Contractually obligated payments for long-term debt due in 2015 702us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Contractually obligated payments for long-term debt due in 2016 2,768us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Contractually obligated payments for long-term debt due in 2017 1,942us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Contractually obligated payments for long-term debt due in 2018 1,407us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Contractually obligated payments for long-term debt due in 2019 1,199us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Thereafter 1,555us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
Total $ 9,573us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		  
[1] At December 31, 2014 and 2013, includes $179 and $49 of cash and due from banks, $47 and $48 of commercial mortgage loans, $3,331 and $1,010 of automobile loans, $(22) and $(15) of ALLL, $25 and $13 of other assets, $5 and $1 of other liabilities, $3,434 and $1,048 of long-term debt from consolidated VIEs that are included in their respective captions. For further information, refer to Note 10.