Lines of Businesses- Contribution of Segments to Overall Profitability (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015
Segment Reporting Information [Line Items]
Fee and other revenue	$ 2,971	[1]	$ 2,961	[2]	$ 3,033	[3]
Net interest revenue	766		760		728
Total revenue	3,737	[1]	3,721	[2]	3,761	[3]
Provision for credit losses	10		163		2
Noninterest expense	2,627	[4]	2,690	[5]	2,700
Income (loss) before taxes	$ 1,100	[1],[4]	$ 868	[2],[5]	$ 1,059	[3]
Pre-tax operating margin (percent)	29.00%	[6]	23.00%	[7]	28.00%	[8]
Average assets	$ 364,554		$ 368,590		$ 368,411
Net income (loss) attributable to noncontrolling interests	(9)		3		31
Investment Management funds
Segment Reporting Information [Line Items]
Fee and other revenue	1		11		21
Investment income (loss), net	(6)		16		52
Net income (loss) attributable to noncontrolling interests	(7)		5		31
Investment Management
Segment Reporting Information [Line Items]
Fee and other revenue	812	[1]	915	[2]	919	[3]
Net interest revenue	83		84		75
Total revenue	895	[1]	999	[2]	994	[3]
Provision for credit losses	(1)		(4)		(1)
Noninterest expense	679		713		732
Income (loss) before taxes	$ 217	[1]	$ 290	[2]	$ 263	[3]
Pre-tax operating margin (percent)	24.00%	[6]	29.00%	[7]	26.00%	[8]
Average assets	$ 29,971		$ 30,982		$ 31,361
Net income (loss) attributable to noncontrolling interests	(7)		5		31
Investment Services
Segment Reporting Information [Line Items]
Fee and other revenue	2,030		1,957		2,029
Net interest revenue	679		664		629
Total revenue	2,709		2,621		2,658
Provision for credit losses	14		8		7
Noninterest expense	1,808		1,831		1,863
Income (loss) before taxes	$ 887		$ 782		$ 788
Pre-tax operating margin (percent)	33.00%	[6]	30.00%	[7]	30.00%	[8]
Average assets	$ 273,289		$ 281,766		$ 287,321
Other
Segment Reporting Information [Line Items]
Fee and other revenue	129		89		85
Net interest revenue	4		12		24
Total revenue	133		101		109
Provision for credit losses	(3)		159		(4)
Noninterest expense	140		146		105
Income (loss) before taxes	(4)		(204)		8
Average assets	61,294		55,842		$ 49,729
Segment Reconciling Items
Segment Reporting Information [Line Items]
Net income (loss) attributable to noncontrolling interests	$ 2		$ (2)

[1] Both fee and other revenue and total revenue include the net income from consolidated investment management funds of $1 million, representing $6 million of losses and a loss attributable to noncontrolling interests of $7 million. Income (loss) before taxes is net of a loss attributable to noncontrolling interests of $7 million.

[2] Both fee and other revenue and total revenue include the net income from consolidated investment management funds of $11 million, representing $16 million of income and noncontrolling interests of $5 million. Income (loss) before taxes is net of noncontrolling interests of $5 million.

[3] Both fee and other revenue and total revenue include net income from consolidated investment management funds of $21 million, representing $52 million of income and noncontrolling interests of $31 million. Income before taxes is net of noncontrolling interests of $31 million.

[4] Noninterest expense includes a loss attributable to noncontrolling interest of $2 million related to other consolidated subsidiaries.

[5] Noninterest expense includes a loss attributable to noncontrolling interest of $2 million related to other consolidated subsidiaries.

[6] Income before taxes divided by total revenue.

[7] Income before taxes divided by total revenue.

[8] Income before taxes divided by total revenue.