Contribution of Segments to Overall Profitability (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended						6 Months Ended
	Jun. 30, 2012		Mar. 31, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Segment Reporting Information [Line Items]
Fee and other revenue	$ 2,854	[1]	$ 2,870	[2]	$ 3,098	[3]	$ 5,724	[4]	$ 6,002	[5]
Net interest revenue	734		765		731		1,499		1,429
Total revenue	3,588		3,635		3,829		7,223		7,431
Provision for credit losses	(19)		5				(14)
Noninterest expense	3,047		2,756		2,816		5,803		5,513
Income (loss) before taxes	560	[1]	874	[2]	1,013	[3]	1,434	[4]	1,918	[5]
Pre-tax operating margin	16.00%	[6]	24.00%	[6]	26.00%	[6]	20.00%	[6]	26.00%	[6]
Average assets	305,002		301,344		278,480		303,172		268,147
Investment Management
Segment Reporting Information [Line Items]
Fee and other revenue	861	[1]	852	[2]	862	[3]	1,713	[4]	1,730	[5]
Net interest revenue	52		55		48		107		100
Total revenue	913		907		910		1,820		1,830
Provision for credit losses					1				1
Noninterest expense	690		667		694		1,357		1,376
Income (loss) before taxes	223	[1]	240	[2]	215	[3]	463	[4]	453	[5]
Pre-tax operating margin	24.00%	[6]	26.00%	[6]	24.00%	[6]	25.00%	[6]	25.00%	[6]
Average assets	35,970		36,475		36,741		36,222		37,027
Investment Services
Segment Reporting Information [Line Items]
Fee and other revenue	1,881		1,852		1,967		3,733		3,856
Net interest revenue	607		642		649		1,249		1,270
Total revenue	2,488		2,494		2,616		4,982		5,126
Provision for credit losses	(14)		16				2
Noninterest expense	2,146		1,827		1,827		3,973		3,579
Income (loss) before taxes	356		651		789		1,007		1,547
Pre-tax operating margin	14.00%	[6]	26.00%	[6]	30.00%	[6]	20.00%	[6]	30.00%	[6]
Average assets	209,454		214,135		191,756		211,795		184,002
Other Operating Segment
Segment Reporting Information [Line Items]
Fee and other revenue	112		166		269		278		416
Net interest revenue	75		68		34		143		59
Total revenue	187		234		303		421		475
Provision for credit losses	(5)		(11)		(1)		(16)		(1)
Noninterest expense	211		262		295		473		558
Income (loss) before taxes	(19)		(17)		9		(36)		(82)
Average assets	$ 59,578		$ 50,734		$ 49,983		$ 55,155		$ 47,118

[1] Total fee and other revenue includes income from consolidated investment management funds of $57 million, net of noncontrolling interests of $29 million, for a net impact of $28 million. Income before taxes includes noncontrolling interests of $29 million.

[2] Total fee and other revenue includes income from consolidated investment management funds of $43 million, net of noncontrolling interests of $11 million, for a net impact of $32 million. Income before taxes includes noncontrolling interests of $11 million.

[3] Total fee and other revenue includes income from consolidated investment management funds of $63 million, net of noncontrolling interests of $21 million, for a net impact of $42 million. Income before taxes includes noncontrolling interests of $21 million.

[4] Total fee and other revenue includes income from consolidated investment management funds of $100 million, net of noncontrolling interests of $40 million, for a net impact of $60 million. Income before taxes includes noncontrolling interests of $40 million.

[5] Total fee and other revenue includes income from consolidated investment management funds of $173 million, net of noncontrolling interests of $65 million, for a net impact of $108 million. Income before taxes includes noncontrolling interests of $65 million.

[6] Income before taxes divided by total revenue.