Contribution of Segments to Overall Profitability (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011
Segment Reporting Information [Line Items]
Fee and other revenue	$ 2,870	[1]	$ 2,788	[2]	$ 2,904	[3]
Net interest revenue	765		780		698
Total revenue	3,635		3,568		3,602
Provision for credit losses	5		23
Noninterest expense	2,756		2,828		2,697
Income (loss) before taxes	874	[1]	717	[2]	905	[3]
Pre-tax operating margin	24.00%	[4]	20.00%	[4]	25.00%	[4]
Average assets	301,344		316,074		257,698
Investment Management
Segment Reporting Information [Line Items]
Fee and other revenue	852	[1]	767	[2]	868	[3]
Net interest revenue	55		55		52
Total revenue	907		822		920
Noninterest expense	667		685		682
Income (loss) before taxes	240	[1]	137	[2]	238	[3]
Pre-tax operating margin	26.00%	[4]	17.00%	[4]	26.00%	[4]
Average assets	36,475		37,163		37,315
Investment Services
Segment Reporting Information [Line Items]
Fee and other revenue	1,854		1,781		1,889
Net interest revenue	644		634		621
Total revenue	2,498		2,415		2,510
Provision for credit losses	16
Noninterest expense	1,829		1,756		1,752
Income (loss) before taxes	653		659		758
Pre-tax operating margin	26.00%	[4]	27.00%	[4]	30.00%	[4]
Average assets	215,899		228,668		176,162
Other Operating Segment
Segment Reporting Information [Line Items]
Fee and other revenue	164		240		147
Net interest revenue	66		91		25
Total revenue	230		331		172
Provision for credit losses	(11)		23
Noninterest expense	260		387		263
Income (loss) before taxes	(19)		(79)		(91)
Average assets	$ 48,970		$ 50,243		$ 44,221

[1] 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.

[2] Total fee and other revenue includes a loss from consolidated investment management funds of $5 million, net of loss attributable to noncontrolling interests of $28 million, for a net impact of $23 million. Income before taxes includes a loss attributable to noncontrolling interests of $28 million.

[3] Total fee and other revenue includes income from consolidated investment management funds of $110 million, net of noncontrolling interests of $44 million, for a net impact of $66 million. Income before taxes includes noncontrolling interests of $44 million.

[4] Income before taxes divided by total revenue.