Nonperforming Assets (Detail) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Nonaccruing	[1],[2]	$ 672	$ 634
OREO	[3]	56	99
Other repossessed assets		7	9
Loans Held-for-sale, Other		0	38
Total nonperforming assets		735	780
Commercial and Industrial Sector [Member]
Nonaccruing		308	151
Commercial Real Estate [Member]
Nonaccruing		11	21
Commercial Construction [Member]
Nonaccruing		0	1
Residential Nonguaranteed [Member]
Nonaccruing		183	254
Home Equity Line of Credit [Member]
Nonaccruing		145	174
Residential Construction [Member]
Nonaccruing		16	27
Consumer Other Direct [Member]
Nonaccruing		6	6
Consumer Indirect [Member]
Nonaccruing		$ 3	$ 0

[1] Nonaccruing loans past due 90 days or more totaled $336 million. Nonaccruing loans past due fewer than 90 days include modified nonaccrual loans reported as TDRs, performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans.

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

[3] 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 $52 million and $57 million at December 31, 2015 and 2014, respectively.