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Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Offsetting Securities Loaned [Abstract]    
Gross Amounts of Financial Assets Recognized $ 3,632 $ 4,293
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [1]
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 3,632 4,293
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (3,467) (4,158)
Net Amount 165 135
Total [Abstract]    
Gross Amounts of Financial Assets Recognized 3,992 5,599
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [1]
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 3,992 5,599
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (3,812) (5,389)
Net Amount 180 210
Options [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 355 1,286
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [1]
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 355 1,286
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (345) (1,230)
Net Amount 10 56
Warrants And Discount Certificates [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized   1
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [1]
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition   1
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments)   (1)
Currency Forward Contracts [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 5 19
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [1]
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 5 19
Net Amount $ 5 $ 19
[1] The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at June 30, 2017 and December 31, 2016.