LHFI Considered Impaired (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011		Sep. 30, 2011		Dec. 31, 2010
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 4,425		$ 4,425		$ 4,687
Amortized Cost	3,906	[1]	3,906	[1]	4,083	[2]
Related Allowance	479		479		605
Average Amortized Cost	3,847		3,951
Interest Income Recognized	35	[3]	95	[3]
Commercial Portfolio Segment | Commercial and Industrial | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	97		97		86
Amortized Cost	96	[1]	96	[1]	67	[2]
Related Allowance	0		0		0
Average Amortized Cost	96		101
Interest Income Recognized	1	[3]	1	[3]
Commercial Portfolio Segment | Commercial Real Estate | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	89		89		110
Amortized Cost	85	[1]	85	[1]	86	[2]
Related Allowance	0		0		0
Average Amortized Cost	81		69
Interest Income Recognized	1	[3]	2	[3]
Commercial Portfolio Segment | Commercial Construction | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	93		93		67
Amortized Cost	91	[1]	91	[1]	52	[2]
Related Allowance	0		0		0
Average Amortized Cost	74		92
Interest Income Recognized	0	[3]	0	[3]
Commercial Portfolio Segment | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	279		279		263
Amortized Cost	272	[1]	272	[1]	205	[2]
Related Allowance	0		0		0
Average Amortized Cost	251		262
Interest Income Recognized	2	[3]	3	[3]
Commercial Portfolio Segment | Commercial and Industrial | Impaired Financing Receivables with Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	123		123		123
Amortized Cost	118	[1]	118	[1]	96	[2]
Related Allowance	21		21		18
Average Amortized Cost	109		123
Interest Income Recognized	1	[3]	1	[3]
Commercial Portfolio Segment | Commercial Real Estate | Impaired Financing Receivables with Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	129		129		103
Amortized Cost	123	[1]	123	[1]	81	[2]
Related Allowance	27		27		19
Average Amortized Cost	120		131
Interest Income Recognized	0	[3]	1	[3]
Commercial Portfolio Segment | Commercial Construction | Impaired Financing Receivables with Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	237		237		673
Amortized Cost	198	[1]	198	[1]	524	[2]
Related Allowance	31		31		138
Average Amortized Cost	192		301
Interest Income Recognized	1	[3]	2	[3]
Commercial Portfolio Segment | Impaired Financing Receivables with Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	489		489		899
Amortized Cost	439	[1]	439	[1]	701	[2]
Related Allowance	79		79		175
Average Amortized Cost	421		555
Interest Income Recognized	2	[3]	4	[3]
Residential Mortgage Loans | Residential Nonguaranteed | Impaired Financing Receivables with Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,848		2,848		2,785
Amortized Cost	2,462	[1]	2,462	[1]	2,467	[2]
Related Allowance	278		278		309
Average Amortized Cost	2,471		2,462
Interest Income Recognized	22	[3]	66	[3]
Residential Mortgage Loans | Home Equity | Impaired Financing Receivables with Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	544		544		503
Amortized Cost	508	[1]	508	[1]	503	[2]
Related Allowance	95		95		93
Average Amortized Cost	496		464
Interest Income Recognized	7	[3]	17	[3]
Residential Mortgage Loans | Residential Construction | Impaired Financing Receivables with Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	253		253		226
Amortized Cost	213	[1]	213	[1]	196	[2]
Related Allowance	25		25		26
Average Amortized Cost	196		196
Interest Income Recognized	2	[3]	5	[3]
Residential Mortgage Loans | Impaired Financing Receivables with Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3,645		3,645		3,514
Amortized Cost	3,183	[1]	3,183	[1]	3,166	[2]
Related Allowance	398		398		428
Average Amortized Cost	3,163		3,122
Interest Income Recognized	31	[3]	88	[3]
Consumer Portfolio Segment | Consumer Other Direct | Impaired Financing Receivables with Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	12		12		11
Amortized Cost	12	[1]	12	[1]	11	[2]
Related Allowance	2		2		2
Average Amortized Cost	12		12
Interest Income Recognized	$ 0	[3]	$ 0	[3]

[1] Amortized cost reflects charge-offs that have been recognized plus other amounts that have been applied to reduce the net book balance.

[2] Amortized cost reflects charge-offs that have been recognized plus other amounts that have been applied to reduce net book balance.

[3] Of the interest income recognized for the three and nine months ended September 30, 2011, cash basis interest income was $6 million and $19 million, respectively.