Nonperforming Assets (Detail) - USD ($) $ in Millions		Sep. 30, 2018		Dec. 31, 2017
Financing Receivable, Recorded Investment, Nonaccrual Status	[2]	$ 695	[1]	$ 674	[3]
OREO	[4]	52		57
Other repossessed assets		7		10
Total nonperforming assets		754		741
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		256	[1]	215	[3]
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		43	[1]	24	[3]
Commercial Construction [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[1]	1	[3]
Residential Nonguaranteed [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		225	[1],[5]	206	[3],[6]
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		149	[1]	203	[3]
Residential Construction [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		9	[1]	11	[3]
Consumer Other Direct [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		7	[1]	7	[3]
Consumer Indirect [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		$ 6	[1]	$ 7	[3]

[1] Includes nonaccruing LHFI past due 90 days or more of $348 million. Nonaccruing LHFI 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] Includes nonaccruing LHFI past due 90 days or more of $357 million. Nonaccruing LHFI 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 $49 million and $45 million at September 30, 2018 and December 31, 2017, respectively.

[5] Includes $168 million of loans measured at fair value, the majority of which were accruing current.

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