v3.4.0.3
Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 3,509 $ 3,946
Amounts Liabilities Offset in the Condensed Consolidated Statement of Financial Condition
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition $ 3,509 $ 3,946
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (3,401) (3,806)
Net Amount of Liabilities 108 140
Securities Loaned [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 2,401 $ 2,894
Amounts Liabilities Offset in the Condensed Consolidated Statement of Financial Condition
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition $ 2,401 $ 2,894
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (2,307) (2,773)
Net Amount of Liabilities 94 121
Options Sold, Not Yet Purchased [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 1,102 $ 1,042
Amounts Liabilities Offset in the Condensed Consolidated Statement of Financial Condition
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition $ 1,102 $ 1,042
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (1,093) (1,032)
Net Amount of Liabilities 9 10
Warrants And Discount Certificates Sold, Not Yet Purchased [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 1 $ 1
Amounts Liabilities Offset in the Condensed Consolidated Statement of Financial Condition
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition $ 1 $ 1
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (1) (1)
Currency Forward Contracts Sold, Not Yet Purchased [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 5 $ 9
Amounts Liabilities Offset in the Condensed Consolidated Statement of Financial Condition
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition $ 5 $ 9
Net Amount of Liabilities $ 5 $ 9