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Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Offsetting Securities Loaned [Abstract]    
Gross Amounts of Financial Assets Recognized $ 3,270 $ 2,894
Amounts Offset in the Condensed Consolidated Statement of Financial Condition
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 3,270 2,894
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (3,168) (2,773)
Net Amount 102 121
Total [Abstract]    
Gross Amounts of Financial Assets Recognized 4,577 3,946
Amounts Offset in the Condensed Consolidated Statement of Financial Condition
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 4,577 3,946
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (4,389) (3,806)
Net Amount 188 140
Options [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 1,296 1,042
Amounts Offset in the Condensed Consolidated Statement of Financial Condition
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 1,296 1,042
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (1,219) (1,032)
Net Amount 77 10
Warrants And Discount Certificates [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 2 1
Amounts Offset in the Condensed Consolidated Statement of Financial Condition
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 2 1
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (2) (1)
Currency Forward Contracts [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 9 9
Amounts Offset in the Condensed Consolidated Statement of Financial Condition
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 9 9
Net Amount $ 9 $ 9