Nonperforming Assets (Detail) - USD ($) $ in Millions		Dec. 31, 2017		Dec. 31, 2016
Financing Receivable, Recorded Investment, Nonaccrual Status	[2]	$ 674	[1]	$ 845	[3]
OREO	[4]	57		60
Other repossessed assets		10		14
Total nonperforming assets		741		919
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		215	[1]	390	[3]
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		24	[1]	7	[3]
Commercial Construction [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		1	[1]	17	[3]
Residential Nonguaranteed [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		206	[1],[5]	177	[3],[6]
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		203	[1]	235	[3]
Residential Construction [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		11	[1]	12	[3]
Consumer Other Direct [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		7	[1]	6	[3]
Consumer Indirect [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		$ 7	[1]	$ 1	[3]

[1] Nonaccruing loans past due 90 days or more totaled $357 million. Nonaccruing loans past due fewer than 90 days include nonaccrual loans modified in 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 loans/NPLs.

[3] Nonaccruing loans past due 90 days or more totaled $360 million. Nonaccruing loans past due fewer than 90 days include nonaccrual loans modified in TDRs, 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 guaranteed by 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 and the VA totaled $45 million and $50 million at December 31, 2017 and 2016, respectively.

[5] Includes $196 million of loans measured at fair value, the majority of which were accruing current.

[6] Includes $222 million of loans measured at fair value, the majority of which were accruing current.