Schedule of Aggregate Maturities of Long-Term Debt Obligations (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Contractually obligated payments for long-term debt due in 2014	$ 157
Contractually obligated payments for long-term debt due in 2015	526
Contractually obligated payments for long-term debt due in 2016	4,091
Contractually obligated payments for long-term debt due in 2017	948
Contractually obligated payments for long-term debt due in 2018	1,147
Contractually obligated payments for long-term debt due after 2018	2,764
Long-term debt	9,633	[1]	7,085	[1]
Parent company
Debt Instrument [Line Items]
Contractually obligated payments for long-term debt due in 2016	1,249
Contractually obligated payments for long-term debt due in 2017	558
Contractually obligated payments for long-term debt due in 2018	555
Contractually obligated payments for long-term debt due after 2018	2,395
Total	4,757
Long-term debt	4,757		5,751
Subsidiaries
Debt Instrument [Line Items]
Contractually obligated payments for long-term debt due in 2014	157
Contractually obligated payments for long-term debt due in 2015	526
Contractually obligated payments for long-term debt due in 2016	2,842
Contractually obligated payments for long-term debt due in 2017	390
Contractually obligated payments for long-term debt due in 2018	592
Contractually obligated payments for long-term debt due after 2018	369
Total	$ 4,876

[1] At December 31, 2013 and 2012, includes $49 and $0 of cash and due from banks, $48 and $50 of commercial mortgage loans, $ 1,010 and $0 of automobile loans, $(15) and $(5) of ALLL, $13 and $3 of other assets, $1 and $0 of other liabilities, $ 1,048 and $0 of long-term debt from consolidated VIEs that are included in their respective captions. See Note 10.