Nonperforming Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Nonaccrual/NPLs	$ 1,547	[1]	$ 2,903	[2]
OREO	264	[3]	479	[3]
Other repossessed assets	9		10
Loans Held-for-sale, Other	37		0
Total nonperforming assets	1,857		3,392
Commercial Portfolio Segment [Member]
Nonaccrual/NPLs	294	[1]	926	[2]
Commercial Portfolio Segment [Member] | Commercial and Industrial
Nonaccrual/NPLs	194	[1]	348	[2]
Commercial Portfolio Segment [Member] | Commercial Real Estate
Nonaccrual/NPLs	66	[1]	288	[2]
Commercial Portfolio Segment [Member] | Commercial Construction [Member]
Nonaccrual/NPLs	34	[1]	290	[2]
Residential Portfolio Segment [Member]
Nonaccrual/NPLs	1,228	[1]	1,950	[2]
Residential Portfolio Segment [Member] | Residential Nonguaranteed [Member]
Nonaccrual/NPLs	775	[1],[4]	1,392	[2],[5]
Residential Portfolio Segment [Member] | Home Equity
Nonaccrual/NPLs	341	[1]	338	[2]
Residential Portfolio Segment [Member] | Residential Construction
Nonaccrual/NPLs	112	[1]	220	[2]
Consumer Portfolio Segment [Member]
Nonaccrual/NPLs	25	[1]	27	[2]
Consumer Portfolio Segment [Member] | Consumer Other Direct
Nonaccrual/NPLs	6	[1]	7	[2]
Consumer Portfolio Segment [Member] | Consumer Indirect
Nonaccrual/NPLs	$ 19	[1]	$ 20	[2]

[1] Total 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.

[2] Total nonaccruing loans past due 90 days or more totaled $2.3 billion. Nonaccruing loans past due fewer than 90 days include modified nonaccrual loans reported as TDRs.

[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 $140 million and $132 million at December 31, 2012 and 2011, respectively.

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

[5] Includes $431 million of loans carried at fair value, the majority of which were accruing current.