Net Interest Revenue (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Interest revenue
Non-margin loans	$ 169	$ 169	$ 165
Margin loans	42	41	38
Securities:
Taxable	405	428	441
Exempt from federal income taxes	27	31	24
Total securities	432	459	465
Deposits with banks	73	70	71
Deposits with the Federal Reserve and other central banks	46	49	31
Federal funds sold and securities purchased under resale agreements	17	14	10
Trading assets	33	44	35
Total interest revenue	812	846	815
Interest expense
Deposits	22	22	30
Federal funds purchased and securities sold under repurchase agreements	(4)	(3)	(3)
Trading liabilities	8	9	9
Other borrowed funds	1	3	2
Customer payables	2	2	2
Long-term debt	55	52	56
Total interest expense	84	85	96
Net interest revenue	$ 728	$ 761	$ 719