LHFI Considered Impaired (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 3,423				$ 3,423				$ 3,625
Impaired Financing Receivable, Recorded Investment	2,983	[1]			2,983	[1]			3,159	[1]
Impaired Financing Receivable, Related Allowance	361				361				363
Impaired Financing Receivable, Interest Income, Cash Basis Method	1		1		2		6
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,032		3,176		3,027		3,165
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	35	[2]	39	[2]	71	[2]	70	[2]
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	103				103				142
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	80	[1]			80	[1]			116	[1]
Impaired Financing Receivable, Unpaid Principal Balance	77				77				65
Impaired Financing Receivable, Recorded Investment	59	[1]			59	[1]			55	[1]
Impaired Financing Receivable, Related Allowance	4				4				10
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	87		126		91		107
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		1	[2]	1	[2]	2	[2]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	66		91		68		84
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		1	[2]	0		1	[2]
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	2,399				2,399				2,568
Impaired Financing Receivable, Recorded Investment	2,271	[1]			2,271	[1]			2,436	[1]
Impaired Financing Receivable, Related Allowance	349				349				345
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,286		2,407		2,270		2,405
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	29	[2]	31	[2]	58	[2]	56	[2]
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	121				121				110
Impaired Financing Receivable, Recorded Investment	121	[1]			121	[1]			110	[1]
Impaired Financing Receivable, Related Allowance	8				8				8
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	130		104		128		108
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	[2]	2	[2]	3	[2]	3	[2]
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	87				87				81
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	66	[1]			66	[1]			56	[1]
Impaired Financing Receivable, Unpaid Principal Balance	57				57				51
Impaired Financing Receivable, Recorded Investment	49	[1]			49	[1]			49	[1]
Impaired Financing Receivable, Related Allowance	4				4				10
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	72		70		76		63
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		1	[2]	1	[2]	1	[2]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	52		80		54		75
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		1	[2]	0		1	[2]
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	16				16				61
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	14	[1]			14	[1]			60	[1]
Impaired Financing Receivable, Unpaid Principal Balance	14				14				8
Impaired Financing Receivable, Recorded Investment	8	[1]			8	[1]			3	[1]
Impaired Financing Receivable, Related Allowance	0				0				0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	15		9		15		8
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	11		3		11		2
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0		0
Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	6				6				6
Impaired Financing Receivable, Recorded Investment	2	[1]			2	[1]			3	[1]
Impaired Financing Receivable, Related Allowance	0				0				0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		47		0		36
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0		1	[2]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3		8		3		7
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0		0
Residential Nonguaranteed [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	723				723				740
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	452	[1]			452	[1]			442	[1]
Impaired Financing Receivable, Unpaid Principal Balance	1,486				1,486				1,617
Impaired Financing Receivable, Recorded Investment	1,467	[1]			1,467	[1]			1,609	[1]
Impaired Financing Receivable, Related Allowance	238				238				226
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	463		448		470		461
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	5	[2]	4	[2]	9	[2]	8	[2]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,456		1,554		1,444		1,547
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	20	[2]	23	[2]	41	[2]	41	[2]
Home Equity Line of Credit [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	702				702				710
Impaired Financing Receivable, Recorded Investment	632	[1]			632	[1]			638	[1]
Impaired Financing Receivable, Related Allowance	88				88				96
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	651		648		648		652
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	7	[2]	5	[2]	13	[2]	10	[2]
Residential Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	211				211				241
Impaired Financing Receivable, Recorded Investment	172	[1]			172	[1]			189	[1]
Impaired Financing Receivable, Related Allowance	23				23				23
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	179		205		178		206
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2	[2]	3	[2]	4	[2]	5	[2]
Consumer Other Direct [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	14				14				14
Impaired Financing Receivable, Recorded Investment	14	[1]			14	[1]			14	[1]
Impaired Financing Receivable, Related Allowance	1				1				0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	14		15		14		15
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0		0
Consumer Indirect [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	97				97				83
Impaired Financing Receivable, Recorded Investment	97	[1]			97	[1]			83	[1]
Impaired Financing Receivable, Related Allowance	5				5				5
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	105		72		103		74
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	[2]	1	[2]	3	[2]	2	[2]
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	10				10				13
Impaired Financing Receivable, Recorded Investment	10	[1]			10	[1]			13	[1]
Impaired Financing Receivable, Related Allowance	2				2				3
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	11		17		11		19
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		1	[2]	0		1
Impaired Financing Receivables With No Related Allowance [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	0				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				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				$ 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 and six months ended June 30, 2014, cash basis interest income was less than $1 million and $2 million, respectively.Of the interest income recognized during the three and six months ended June 30, 2013, cash basis interest income was $1 million and $6 million, respectively.