LHFI Considered Impaired (Detail) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011		Jun. 30, 2011		Dec. 31, 2010
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 4,540		$ 4,540		$ 4,687
Amortized Cost	3,914	[1]	3,914	[1]	4,083	[2]
Related Allowance	564		564		605
Average Amortized Cost	3,963		3,998
Interest Income Recognized	31	[3]	62	[3]
Commercial Portfolio Segment | Commercial and Industrial | Impaired Financing Receivables with No Related Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	109		109		86
Amortized Cost	100	[1]	100	[1]	67	[2]
Average Amortized Cost	102		103
Commercial Portfolio Segment | Commercial Real Estate | Impaired Financing Receivables with No Related Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	87		87		110
Amortized Cost	62	[1]	62	[1]	86	[2]
Average Amortized Cost	68		63
Interest Income Recognized	1	[3]	1	[3]
Commercial Portfolio Segment | Commercial Construction | Impaired Financing Receivables with No Related Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	62		62		67
Amortized Cost	51	[1]	51	[1]	52	[2]
Average Amortized Cost	94		102
Interest Income Recognized	1	[3]	2	[3]
Commercial Portfolio Segment | Impaired Financing Receivables with No Related Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	258		258		263
Amortized Cost	213	[1]	213	[1]	205	[2]
Average Amortized Cost	264		268
Interest Income Recognized	2	[3]	3	[3]
Commercial Portfolio Segment | Commercial and Industrial | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	97		97		123
Amortized Cost	86	[1]	86	[1]	96	[2]
Related Allowance	26		26		18
Average Amortized Cost	88		130
Commercial Portfolio Segment | Commercial Real Estate | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	169		169		103
Amortized Cost	138	[1]	138	[1]	81	[2]
Related Allowance	35		35		19
Average Amortized Cost	154		136
Interest Income Recognized	1	[3]	1	[3]
Commercial Portfolio Segment | Commercial Construction | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	394		394		673
Amortized Cost	300	[1]	300	[1]	524	[2]
Related Allowance	104		104		138
Average Amortized Cost	321		356
Interest Income Recognized			1	[3]
Commercial Portfolio Segment | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	660		660		899
Amortized Cost	524	[1]	524	[1]	701	[2]
Related Allowance	165		165		175
Average Amortized Cost	563		622
Interest Income Recognized	1	[3]	2	[3]
Residential Mortgage Loans | Residential Nonguaranteed | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,860		2,860		2,785
Amortized Cost	2,488	[1]	2,488	[1]	2,467	[2]
Related Allowance	283		283		309
Average Amortized Cost	2,445		2,455
Interest Income Recognized	22	[3]	44	[3]
Residential Mortgage Loans | Home Equity | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	521		521		503
Amortized Cost	488	[1]	488	[1]	503	[2]
Related Allowance	92		92		93
Average Amortized Cost	487		447
Interest Income Recognized	5	[3]	10	[3]
Residential Mortgage Loans | Residential Construction | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	228		228		226
Amortized Cost	188	[1]	188	[1]	196	[2]
Related Allowance	22		22		26
Average Amortized Cost	191		195
Interest Income Recognized	1	[3]	3	[3]
Residential Mortgage Loans | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3,609		3,609		3,514
Amortized Cost	3,164	[1]	3,164	[1]	3,166	[2]
Related Allowance	397		397		428
Average Amortized Cost	3,123		3,097
Interest Income Recognized	28	[3]	57	[3]
Consumer Portfolio Segment | Consumer Other Direct | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	13		13		11
Amortized Cost	13	[1]	13	[1]	11	[2]
Related Allowance	2		2		2
Average Amortized Cost	$ 13		$ 11

[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 six months ended June 30, 2011, cash basis interest income was $7 million and $13 million, respectively.