Nonperforming Assets (Detail) - USD ($) $ in Millions		Mar. 31, 2019		Dec. 31, 2018
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 522	[2]	$ 526	[3]
OREO	[4]	53		54
Other repossessed assets		9		9
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	[5]	1,781		1,468
Total nonperforming assets		648		589
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		197	[2]	157	[3]
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		2	[2]	2	[3]
Commercial Construction [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		0	[2]	0	[3]
Residential Nonguaranteed [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		178	[2],[6]	204	[3],[7]
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		124	[2]	138	[3]
Residential Construction [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		8	[2]	11	[3]
Consumer Other Direct [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		8	[2]	7	[3]
Consumer Indirect [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		5	[2]	7	[3]
Nonaccrual loans [Member]
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group		$ 64		$ 0

[1] Nonaccruing restructured LHFI are included in total nonaccrual LHFI/NPLs.

[2] Includes nonaccruing LHFI past due 90 days or more of $296 million. Nonaccruing LHFI past due fewer than 90 days include nonaccrual LHFI modified in TDRs, performing second lien LHFI where the first lien loan is nonperforming, and certain energy-related commercial LHFI.

[3] Includes nonaccruing LHFI past due 90 days or more of $306 million. Nonaccruing LHFI past due fewer than 90 days include nonaccrual LHFI modified in TDRs, performing second lien LHFI where the first lien loan is nonperforming, and certain energy-related commercial LHFI.

[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 $50 million at both March 31, 2019 and December 31, 2018.

[5] Includes $1.1 billion and $1.2 billion of LHFS measured at fair value at March 31, 2019 and December 31, 2018, respectively.

[6] Includes $134 million of LHFI measured at fair value, the majority of which were accruing current.

[7] Includes $163 million of LHFI measured at fair value, the majority of which were accruing current.