Lines of Businesses- Contribution of Segments to Overall Profitability (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014
Segment Reporting Information [Line Items]
Fee and other revenue	$ 3,033	[1]	$ 2,953	[2]	$ 2,899	[3]
Net interest revenue	728		712		728
Total revenue	3,761	[1]	3,665	[2]	3,627	[3]
Provision for credit losses	2		1		(18)
Noninterest expense	2,700		3,524		2,739
Income before taxes	1,059	[1]	140	[2]	906	[3]
Pre-tax operating margin (percent)	28.00%	[4]	4.00%	[4]	25.00%	[4]
Average assets	374,890		385,232		354,992
Net income attributable to noncontrolling interests	90		24		20
Investment Management funds
Segment Reporting Information [Line Items]
Fee and other revenue	31		18		16
Investment income, net	121		42		36
Net income attributable to noncontrolling interests	90		24		20
Investment Management
Segment Reporting Information [Line Items]
Fee and other revenue	936	[1]	929	[2]	900	[3]
Net interest revenue	74		69		70
Total revenue	1,010	[1]	998	[2]	970	[3]
Provision for credit losses	0		0		0
Noninterest expense	746		759		724
Income before taxes	264	[1]	239	[2]	246	[3]
Pre-tax operating margin (percent)	26.00%	[4]	24.00%	[4]	25.00%	[4]
Average assets	37,496		37,286		39,463
Net income attributable to noncontrolling interests	(90)		(24)		(20)
Investment Services
Segment Reporting Information [Line Items]
Fee and other revenue	1,993		1,907		1,887
Net interest revenue	600		574		590
Total revenue	2,593		2,481		2,477
Provision for credit losses	0		0		0
Noninterest expense	1,838		2,555		1,822
Income before taxes	755		(74)		655
Pre-tax operating margin (percent)	29.00%	[4]	(3.00%)	[4]	26.00%	[4]
Average assets	284,978		276,586		258,470
Other
Segment Reporting Information [Line Items]
Fee and other revenue	104		117		112
Net interest revenue	54		69		68
Total revenue	158		186		180
Provision for credit losses	2		1		(18)
Noninterest expense	116		210		193
Income before taxes	40		(25)		5
Average assets	$ 52,416		$ 71,360		$ 57,059

[1] Both total fee and other revenue and total revenue include the net income from consolidated investment management funds of $31 million, representing $121 million of income and noncontrolling interests of $90 million. Income before taxes is net of noncontrolling interests of $90 million.

[2] Both total fee and other revenue and total revenue include the net income from consolidated investment management funds of $18 million, representing $42 million of income and noncontrolling interests of $24 million. Income before taxes is net of noncontrolling interests of $24 million.

[3] Both total fee and other revenue and total revenue include the net income from consolidated investment management funds of $16 million, representing $36 million of income and noncontrolling interests of $20 million. Income before taxes is net of noncontrolling interests of $20 million.

[4] Income before taxes divided by total revenue.