LHFI Considered Impaired (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Interest Income, Cash Basis Method	$ 10		$ 18		$ 25
Impaired Financing Receivable, Unpaid Principal Balance	3,625		3,523
Impaired Financing Receivable, Recorded Investment	3,159	[1]	3,078	[1]
Impaired Financing Receivable, Related Allowance	363		364
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,175		3,154		3,751
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	138	[2]	127	[2]	132	[2]
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	135		102		212
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	3	[2]	2	[2]	5	[2]
Impaired Financing Receivable, Unpaid Principal Balance	65		66
Impaired Financing Receivable, Recorded Investment	55	[1]	48	[1]
Impaired Financing Receivable, Related Allowance	10		7
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	53		64		292
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	[2]	1	[2]	5	[2]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	142		110
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	116	[1]	90	[1]
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	3,308		3,266
Impaired Financing Receivable, Recorded Investment	2,878	[1]	2,859	[1]
Impaired Financing Receivable, Related Allowance	345		348
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,867		2,899		3,208
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	128	[2]	119	[2]	119	[2]
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	110		81
Impaired Financing Receivable, Recorded Investment	110	[1]	81	[1]
Impaired Financing Receivable, Related Allowance	8		9
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	120		89		39
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	6	[2]	5	[2]	3	[2]
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	75		48		109
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	[2]	1	[2]	3	[2]
Impaired Financing Receivable, Unpaid Principal Balance	51		46
Impaired Financing Receivable, Recorded Investment	49	[1]	38	[1]
Impaired Financing Receivable, Related Allowance	10		6
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	45		51		68
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	[2]	1	[2]	1	[2]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	81		59
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	56	[1]	40	[1]
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	60		9		56
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	2	[2]	0	[2]	1	[2]
Impaired Financing Receivable, Unpaid Principal Balance	8		15
Impaired Financing Receivable, Recorded Investment	3	[1]	7	[1]
Impaired Financing Receivable, Related Allowance	0		1
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3		9		103
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	[2]	0	[2]	2	[2]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	61		6
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	60	[1]	5	[1]
Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		45		47
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	[2]	1	[2]	1	[2]
Impaired Financing Receivable, Unpaid Principal Balance	6		5
Impaired Financing Receivable, Recorded Investment	3	[1]	3	[1]
Impaired Financing Receivable, Related Allowance	0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5		4		121
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	[2]	0	[2]	2	[2]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0		45
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	[1]	45	[1]
Residential Nonguaranteed [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	2,357		2,346
Impaired Financing Receivable, Recorded Investment	2,051	[1]	2,046	[1]
Impaired Financing Receivable, Related Allowance	226		234
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,025		2,063		2,451
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	94	[2]	83	[2]	88	[2]
Home Equity Line of Credit [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	710		661
Impaired Financing Receivable, Recorded Investment	638	[1]	612	[1]
Impaired Financing Receivable, Related Allowance	96		88
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	649		627		528
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	23	[2]	26	[2]	23	[2]
Residential Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	241		259
Impaired Financing Receivable, Recorded Investment	189	[1]	201	[1]
Impaired Financing Receivable, Related Allowance	23		26
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	193		209		229
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	11	[2]	10	[2]	8	[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	0		2
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	15		15		13
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	[2]	1	[2]	1	[2]
Consumer Indirect [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	83		46
Impaired Financing Receivable, Recorded Investment	83	[1]	46	[1]
Impaired Financing Receivable, Related Allowance	5		2
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	89		50		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	4	[2]	2	[2]	0	[2]
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	13		21
Impaired Financing Receivable, Recorded Investment	13	[1]	21	[1]
Impaired Financing Receivable, Related Allowance	3		5
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	16		24		26
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	[2]	2	[2]	2	[2]
Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance			0
Impaired Financing Receivables With No Related Allowance [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	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 year ended December 31, 2013, 2012, and 2011, cash basis interest income was $10 million, $18 million, and $25 million, respectively.