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Net Interest Revenue (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Interest revenue      
Non-margin loans $ 205 $ 187 $ 173
Margin loans 63 53 50
Securities:      
Taxable 444 453 439
Exempt from federal income taxes 18 19 22
Total securities 462 472 461
Deposits with banks 26 22 30
Deposits with the Federal Reserve and other central banks 61 39 45
Federal funds sold and securities purchased under resale agreements 49 42 30
Trading assets 17 19 18
Total interest revenue 883 834 807
Interest expense      
Deposits 15 5 15
Federal funds purchased and securities sold under repurchase agreements 9 (1) (3)
Trading liabilities 2 2 2
Other borrowed funds 2 2 2
Customer payables 4 2 2
Long-term debt 85 64 61
Total interest expense 117 74 79
Net interest revenue $ 766 $ 760 $ 728