Nonperforming Assets (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Nonaccrual/NPLs	$ 1,467	[1]	$ 1,547	[2]
OREO	224	[3]	264	[3]
Other repossessed assets	8		9
Loans Held-for-sale, Other	41		37
Total nonperforming assets	1,740		1,857
Commercial Portfolio Segment [Member]
Nonaccrual/NPLs	289	[1]	294	[2]
Commercial Portfolio Segment [Member] | Commercial and Industrial
Nonaccrual/NPLs	205	[1]	194	[2]
Commercial Portfolio Segment [Member] | Commercial Real Estate
Nonaccrual/NPLs	59	[1]	66	[2]
Commercial Portfolio Segment [Member] | Commercial Construction [Member]
Nonaccrual/NPLs	25	[1]	34	[2]
Residential Portfolio Segment [Member]
Nonaccrual/NPLs	1,157	[1]	1,228	[2]
Residential Portfolio Segment [Member] | Residential Nonguaranteed [Member]
Nonaccrual/NPLs	721	[1],[4]	775	[2],[5]
Residential Portfolio Segment [Member] | Home Equity
Nonaccrual/NPLs	334	[1]	341	[2]
Residential Portfolio Segment [Member] | Residential Construction
Nonaccrual/NPLs	102	[1]	112	[2]
Consumer Portfolio Segment [Member]
Nonaccrual/NPLs	21	[1]	25	[2]
Consumer Portfolio Segment [Member] | Consumer Other Direct
Nonaccrual/NPLs	6	[1]	6	[2]
Consumer Portfolio Segment [Member] | Consumer Indirect
Nonaccrual/NPLs	$ 15	[1]	$ 19	[2]

[1] 2Nonaccruing loans past due 90 days or more totaled $883 million. Nonaccruing loans past due fewer than 90 days include modified nonaccrual loans reported as TDRs and performing second lien loans which are classified as nonaccrual when the first lien loan is nonperforming.

[2] Nonaccruing loans past due 90 days or more totaled $975 million. Nonaccruing loans past due fewer than 90 days include modified nonaccrual loans reported as TDRs and performing second lien loans which are classified as nonaccrual when the first lien loan is nonperforming.

[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 until the funds are received and the property is conveyed. The receivable amount related to proceeds due from the FHA or the VA totaled $159 million and $140 million at March 31, 2013 and December 31, 2012, respectively.

[4] 1Includes $360 million of loans carried at fair value, the majority of which were accruing current.

[5] Includes $379 million of loans carried at fair value, the majority of which were accruing current.