Fair Value Option- Assets and Liabilities, by Type, of Consolidated Investment Management Funds Recorded at Fair Value (Detail) (Investment Management funds, USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Investment Management funds
Assets of consolidated investment management funds:
Trading assets	$ 10,260	$ 10,397
Other assets	1,191	875
Fair value of assets	11,451	11,272
Liabilities of consolidated investment management funds:
Trading liabilities	10,002	10,085
Other liabilities	156	46
Fair value of liabilities	$ 10,158	$ 10,131