Nonperforming Assets (Additional Information) (Detail) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015
Other Real Estate	[1]	$ 60	$ 56
Accrual Loans [Member]
Financing Receivable, Modifications, Recorded Investment		2,500	2,600
Mortgage Loans in Process of Foreclosure, Amount	[2]	122	152
Proceeds due from FHA or VA [Member]
Mortgage Loans in Process of Foreclosure, Amount	[2]	114	141
Other Real Estate		50	52
Nonaccrual loans [Member]
Mortgage Loans in Process of Foreclosure, Amount	[2]	85	112
Residential Portfolio Segment [Member]
Other Real Estate	[1]	50	39
Commercial Portfolio Segment [Member]
Other Real Estate	[1]	$ 7	$ 11

[1] Does not include foreclosed real estate related to loans insured by the FHA or the VA. Proceeds due from the FHA and the VA are recorded as a receivable in other assets in the Consolidated Balance Sheets until the property is conveyed and the funds are received. The receivable related to proceeds due from the FHA or the VA totaled $50 million and $52 million at December 31, 2016 and 2015, respectively.

[2] Nonaccruing restructured loans are included in total nonaccrual/NPLs.