Other Assets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Other Assets [Abstract]
Corporate/bank owned life insurance	$ 4,558		$ 4,482
Accounts receivable	4,032		3,616
Fails to deliver	3,311		864
Equity in joint ventures and other investments	2,792	[1]	3,220	[1]
Income taxes receivable	1,516		2,499
Software	1,326		1,251
Prepaid pension assets	1,299		1,209
Fair value of hedging derivatives	777		1,282
Prepaid expenses	401		451
Due from customers on acceptances	54		379
Other	1,457		1,313
Total other assets	$ 21,523		$ 20,566

[1] Includes Federal Reserve Bank stock of $446 million and $441 million, respectively, at cost