Lines of Businesses- Contribution of Segments to Overall Profitability (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended						9 Months Ended
	Sep. 30, 2014		Jun. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Segment Reporting Information [Line Items]
Fee and other revenue	$ 3,867	[1]	$ 3,009	[2]	$ 3,003	[3],[4]	$ 9,775	[5]	$ 9,126	[3],[6]
Net interest revenue	721		719		772		2,168		2,248
Total revenue	4,588	[1]	3,728	[2]	3,775	[3],[4]	11,943	[5]	11,374	[3],[6]
Provision for credit losses	(19)		(12)		2		(49)		(41)
Noninterest expense	2,968		2,946		2,779		8,653		8,429
Income (loss) before taxes	1,639	[1]	794	[2]	994	[3],[4]	3,339	[5]	2,986	[3],[6]
Pre-tax operating margin (percent)	36.00%	[7]	21.00%	[7]	26.00%	[3],[7]	28.00%	[7]	26.00%	[3],[7]
Average assets	380,409		369,212		341,750		368,297		337,651
Investment Management
Segment Reporting Information [Line Items]
Fee and other revenue	934	[1]	970	[2]	882	[3],[4]	2,804	[5]	2,675	[3],[6]
Net interest revenue	69		66		67		205		192
Total revenue	1,003	[1]	1,036	[2]	949	[3],[4]	3,009	[5]	2,867	[3],[6]
Provision for credit losses	0		0		0		0		0
Noninterest expense	758		865		724		2,347		2,165
Income (loss) before taxes	245	[1]	171	[2]	225	[3],[4]	662	[5]	702	[3],[6]
Pre-tax operating margin (percent)	24.00%	[7]	16.00%	[7]	24.00%	[3],[7]	22.00%	[7]	24.00%	[3],[7]
Average assets	36,670		37,750		38,690		37,951		38,462
Investment Services
Segment Reporting Information [Line Items]
Fee and other revenue	2,005		1,920		1,949	[3]	5,812		5,780	[3]
Net interest revenue	583		593		619		1,766		1,905
Total revenue	2,588		2,513		2,568	[3]	7,578		7,685	[3]
Provision for credit losses	0		0		0		0		1
Noninterest expense	1,879		1,868		1,811		5,569		5,533
Income (loss) before taxes	709		645		757	[3]	2,009		2,151	[3]
Pre-tax operating margin (percent)	27.00%	[7]	26.00%	[7]	29.00%	[3],[7]	26.00%	[7]	27.00%	[3],[7]
Average assets	266,455		264,221		246,252		263,078		243,769
Other
Segment Reporting Information [Line Items]
Fee and other revenue	928		119		172	[3]	1,159		671	[3]
Net interest revenue	69		60		86		197		151
Total revenue	997		179		258	[3]	1,356		822	[3]
Provision for credit losses	(19)		(12)		2		(49)		(42)
Noninterest expense	331		213		244		737		731
Income (loss) before taxes	685		(22)		12	[3]	668		133	[3]
Average assets	$ 77,284		$ 67,241		$ 56,808		$ 67,268		$ 55,420

[1] Both total fee and other revenue and total revenue include income from consolidated investment management funds of $39 million, net of noncontrolling interests of $23 million, for a net impact of $16 million. Income before taxes is net of noncontrolling interests of $23 million.

[2] Both total fee and other revenue and total revenue include income from consolidated investment management funds of $46 million, net of noncontrolling interests of $17 million, for a net impact of $29 million. Income before taxes is net of noncontrolling interests of $17 million.

[3] Consolidated results and Other segment results have been restated to reflect the retrospective application of adopting new accounting guidance in the first quarter of 2014 related to our investments in qualified affordable housing projects (ASU 2014-01). See Note 2 of the Notes to Consolidated Financial Statements for additional information.

[4] Both total fee and other revenue and total revenue include income from consolidated investment management funds of $32 million, net of noncontrolling interests of $8 million, for a net impact of $24 million. Income before taxes is net of noncontrolling interests of $8 million.

[5] Both total fee and other revenue and total revenue include income from consolidated investment management funds of $121 million, net of noncontrolling interests of $60 million, for a net impact of $61 million. Income before taxes is net of noncontrolling interests of $60 million.

[6] Both total fee and other revenue and total revenue include income from consolidated investment management funds of $147 million, net of noncontrolling interests of $63 million, for a net impact of $84 million. Income before taxes is net of noncontrolling interests of $63 million.

[7] Income before taxes divided by total revenue.