LHFI Considered Impaired (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 3,546				$ 3,625
Impaired Financing Receivable, Recorded Investment	3,100	[1]			3,159	[1]
Impaired Financing Receivable, Related Allowance	380				363
Impaired Financing Receivable, Interest Income, Cash Basis Method	1		4
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,116		3,097
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	36	[2]	31	[2]
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	83				142
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	66	[1]			116	[1]
Impaired Financing Receivable, Unpaid Principal Balance	88				65
Impaired Financing Receivable, Recorded Investment	75	[1]			55	[1]
Impaired Financing Receivable, Related Allowance	15				10
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	68		103
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	[2]	1	[2]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	79		44
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	3,259				3,308
Impaired Financing Receivable, Recorded Investment	2,843	[1]			2,878	[1]
Impaired Financing Receivable, Related Allowance	357				345
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,850		2,855
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	34	[2]	29	[2]
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	116				110
Impaired Financing Receivable, Recorded Investment	116	[1]			110	[1]
Impaired Financing Receivable, Related Allowance	8				8
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	119		95
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	[2]	1	[2]
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	65				81
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	52	[1]			56	[1]
Impaired Financing Receivable, Unpaid Principal Balance	64				51
Impaired Financing Receivable, Recorded Investment	59	[1]			49	[1]
Impaired Financing Receivable, Related Allowance	14				10
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	52		49
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	[2]	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	63		29
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	12				61
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	11	[1]			60	[1]
Impaired Financing Receivable, Unpaid Principal Balance	18				8
Impaired Financing Receivable, Recorded Investment	12	[1]			3	[1]
Impaired Financing Receivable, Related Allowance	1				0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	11		9
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	12		10
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6				0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3	[1]			0
Impaired Financing Receivable, Unpaid Principal Balance	6				6
Impaired Financing Receivable, Recorded Investment	4	[1]			3	[1]
Impaired Financing Receivable, Related Allowance	0				0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5		45
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		1	[2]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	4		5
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Residential Nonguaranteed [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	2,328				2,357
Impaired Financing Receivable, Recorded Investment	2,031	[1]			2,051	[1]
Impaired Financing Receivable, Related Allowance	242				226
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,031		2,020
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	25	[2]	22	[2]
Home Equity Line of Credit [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	706				710
Impaired Financing Receivable, Recorded Investment	631	[1]			638	[1]
Impaired Financing Receivable, Related Allowance	92				96
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	637		629
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	7	[2]	5	[2]
Residential Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	225				241
Impaired Financing Receivable, Recorded Investment	181	[1]			189	[1]
Impaired Financing Receivable, Related Allowance	23				23
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	182		206
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2	[2]	2	[2]
Consumer Other Direct [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	14				14
Impaired Financing Receivable, Recorded Investment	14	[1]			14	[1]
Impaired Financing Receivable, Related Allowance	1				0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	14		15
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Consumer Indirect [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	91				83
Impaired Financing Receivable, Recorded Investment	91	[1]			83	[1]
Impaired Financing Receivable, Related Allowance	5				5
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	93		60
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	[2]	1	[2]
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	11				13
Impaired Financing Receivable, Recorded Investment	11	[1]			13	[1]
Impaired Financing Receivable, Related Allowance	2				3
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	12		20
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0
Impaired Financing Receivables With No Related Allowance [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	0				0
Impaired Financing Receivables With No Related Allowance [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	0				0
Impaired Financing Receivables With No Related Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	0				0
Impaired Financing Receivables With No Related Allowance [Member] | Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	$ 0				$ 0

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

[2] Of the interest income recognized during the three months ended March 31, 2014, and 2013, cash basis interest income was $1 million and $4 million, respectively.