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Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Offsetting Securities Loaned [Abstract]    
Gross Amounts of Financial Assets Recognized $ 4,293 $ 2,894
Amounts Offset in the Consolidated Statement of Financial Condition [1]
Net Amounts Presented in Consolidated Statement of Financial Condition 4,293 2,894
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments) (4,158) (2,773)
Net Amount 135 121
Total [Abstract]    
Gross Amounts of Financial Assets Recognized 5,599 3,946
Amounts Offset in the Consolidated Statement of Financial Condition [1]
Net Amounts Presented in Consolidated Statement of Financial Condition 5,599 3,946
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments) (5,389) (3,806)
Net Amount 210 140
Options [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 1,286 1,042
Amounts Offset in the Consolidated Statement of Financial Condition [1]
Net Amounts Presented in Consolidated Statement of Financial Condition 1,286 1,042
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments) (1,230) (1,032)
Net Amount 56 10
Warrants And Discount Certificates [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 1 1
Amounts Offset in the Consolidated Statement of Financial Condition [1]
Net Amounts Presented in Consolidated Statement of Financial Condition 1 1
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments) (1) (1)
Currency Forward Contracts [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 19 9
Amounts Offset in the Consolidated Statement of Financial Condition [1]
Net Amounts Presented in Consolidated Statement of Financial Condition 19 9
Net Amount $ 19 $ 9
[1] The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at December 31, 2016 and 2015.