Nonperforming Assets (Detail) - USD ($) $ in Millions		Dec. 31, 2016		Dec. 31, 2015
Nonaccruing	[2]	$ 845	[1]	$ 672	[3]
OREO	[4]	60		56
Other repossessed assets		14		7
Total nonperforming assets		919		735
Commercial and Industrial [Member]
Nonaccruing		390		308
Commercial Real Estate [Member]
Nonaccruing		7		11
Commercial Construction [Member]
Nonaccruing		17		0
Residential Nonguaranteed [Member]
Nonaccruing		177		183
Home Equity Line of Credit [Member]
Nonaccruing		235		145
Residential Construction [Member]
Nonaccruing		12		16
Consumer Other Direct [Member]
Nonaccruing		6		6
Consumer Indirect [Member]
Nonaccruing		$ 1		$ 3

[1] Nonaccruing loans past due 90 days or more totaled $360 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] 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 and performing second lien loans where the first lien loan is nonperforming, and certain energy-related commercial loans.

[4] 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.