Securitizations and Variable Interest Entities- Incremental Assets and Liabilities of Variable Interest Entities Included in Consolidated Financial Statements (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 investment	Mar. 31, 2014 Variable Interest Entity, Primary Beneficiary	Dec. 31, 2013 Variable Interest Entity, Primary Beneficiary	Mar. 31, 2014 Variable Interest Entity, Primary Beneficiary Investment Management funds	Dec. 31, 2013 Variable Interest Entity, Primary Beneficiary Investment Management funds	Mar. 31, 2014 Variable Interest Entity, Primary Beneficiary Securitizations	Dec. 31, 2013 Variable Interest Entity, Primary Beneficiary Securitizations
Variable Interest Entity [Line Items]
Number of securitizations assessed for consolidation (investments)	2
Available-for-sale		$ 492	$ 487	$ 0	$ 0	$ 492	$ 487
Trading assets		10,260	10,397	10,260	10,397	0	0
Other assets		1,191	875	1,191	875	0	0
Subtotal assets of consolidated investment management funds, at fair value		11,943	11,759	11,451	11,272	492	487
Trading liabilities		10,002	10,085	10,002	10,085	0	0
Other liabilities		601	484	156	46	445	438
Fair value of liabilities		10,603	10,569	10,158	10,131	445	438
Nonredeemable noncontrolling interests of consolidated investment management funds		$ 771	$ 783	$ 771	$ 783	$ 0	$ 0