Other Assets - Other Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Other Assets [Abstract]
Property, leasehold improvements and equipment	$ 11,347	$ 9,956
Goodwill and identifiable intangible assets	4,104	4,148
Income tax-related assets	5,630	5,548
Equity-method investments	213	258
Miscellaneous receivables and other	3,924	5,308
Total	$ 25,218	$ 25,218