Nonperforming Assets (Additional Information) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Other Real Estate	$ 79	[1]	$ 99	[1]
Proceeds due from FHA or VA [Member]
Other Real Estate	$ 61	[2]	$ 57	[2]

[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 funds are received and the property is conveyed. The receivable amount related to proceeds due from the FHA or the VA totaled $61 million and $57 million at March 31, 2015 and December 31, 2014, respectively.

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