Business Segment Reporting (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Average total assets	$ 171,808		$ 176,855
Average total liabilities	150,691		156,599
Average total equity	21,117		20,256
Net, interest income	1,221		1,311
FTE adjustment	30		31
Net interest income (FTE)	1,251	[1]	1,342	[1]
Provision for Loan, Lease, and Other Losses	212	[2]	317	[2]
Net interest income/(loss) after provision for credit losses	1,039		1,025
Noninterest income	863		876
Total noninterest expense	1,363		1,541
Income/(loss) before provision/(benefit) for income taxes	539		360
Provision/(benefit) for income taxes	181	[3]	100	[3]
Net income/(loss) including income attributable to noncontrolling interest	358		260
Net income attributable to noncontrolling interest	6		10
Net income	352		250
Consumer Banking and Private Wealth Management [Member]
Average total assets	44,556		46,285
Average total liabilities	78,752		77,736
Average total equity	0		0
Net, interest income	602		634
FTE adjustment	0		0
Net interest income (FTE)	602	[1]	634	[1]
Provision for Loan, Lease, and Other Losses	99	[2]	155	[2]
Net interest income/(loss) after provision for credit losses	503		479
Noninterest income	326		339
Total noninterest expense	674		731
Income/(loss) before provision/(benefit) for income taxes	155		87
Provision/(benefit) for income taxes	57	[3]	32	[3]
Net income/(loss) including income attributable to noncontrolling interest	98		55
Net income attributable to noncontrolling interest	0		0
Net income	98		55
Wholesale Banking [Member]
Average total assets	66,226		63,599
Average total liabilities	53,842		55,097
Average total equity	0		0
Net, interest income	433		424
FTE adjustment	29		29
Net interest income (FTE)	462	[1]	453	[1]
Provision for Loan, Lease, and Other Losses	37	[2]	101	[2]
Net interest income/(loss) after provision for credit losses	425		352
Noninterest income	337		363
Total noninterest expense	426		487
Income/(loss) before provision/(benefit) for income taxes	336		228
Provision/(benefit) for income taxes	104	[3]	62	[3]
Net income/(loss) including income attributable to noncontrolling interest	232		166
Net income attributable to noncontrolling interest	4		8
Net income	228		158
Mortgage Banking
Average total assets	33,185		35,235
Average total liabilities	4,337		3,828
Average total equity	0		0
Net, interest income	127		126
FTE adjustment	0		0
Net interest income (FTE)	127	[1]	126	[1]
Provision for Loan, Lease, and Other Losses	90	[2]	166	[2]
Net interest income/(loss) after provision for credit losses	37		(40)
Noninterest income	198		157
Total noninterest expense	271		333
Income/(loss) before provision/(benefit) for income taxes	(36)		(216)
Provision/(benefit) for income taxes	(15)	[3]	(86)	[3]
Net income/(loss) including income attributable to noncontrolling interest	(21)		(130)
Net income attributable to noncontrolling interest	0		0
Net income	(21)		(130)
Corporate Other
Average total assets	26,272		30,830
Average total liabilities	13,888		20,408
Average total equity	0		0
Net, interest income	85		126
FTE adjustment	1		1
Net interest income (FTE)	86	[1]	127	[1]
Provision for Loan, Lease, and Other Losses	0	[2]	0	[2]
Net interest income/(loss) after provision for credit losses	86		127
Noninterest income	4		20
Total noninterest expense	(6)		(7)
Income/(loss) before provision/(benefit) for income taxes	96		154
Provision/(benefit) for income taxes	30	[3]	49	[3]
Net income/(loss) including income attributable to noncontrolling interest	66		105
Net income attributable to noncontrolling interest	2		2
Net income	64		103
Reconciling Items
Average total assets	1,569		906
Average total liabilities	(128)		(470)
Average total equity	21,117		20,256
Net, interest income	(26)		1
FTE adjustment	0		1
Net interest income (FTE)	(26)	[1]	2	[1]
Provision for Loan, Lease, and Other Losses	(14)	[2]	(105)	[2]
Net interest income/(loss) after provision for credit losses	(12)		107
Noninterest income	(2)		(3)
Total noninterest expense	(2)		(3)
Income/(loss) before provision/(benefit) for income taxes	(12)		107
Provision/(benefit) for income taxes	5	[3]	43	[3]
Net income/(loss) including income attributable to noncontrolling interest	(17)		64
Net income attributable to noncontrolling interest	0		0
Net income	$ (17)		$ 64

[1] 1 Presented on a matched maturity funds transfer price basis for the segments.

[2] 2 Provision for credit losses represents net charge-offs for the segments.

[3] 3 Includes regular income tax provision/(benefit) and taxable-equivalent income adjustment reversal.