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Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Offsetting Securities Loaned [Abstract]    
Gross Amounts of Financial Assets Recognized $ 4,037 $ 4,444
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 4,037 4,444
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (3,838) (4,201)
Net Amount 199 243
Securities Sold under Agreements to Repurchase [Abstract]    
Gross Amounts of Financial Assets Recognized 1,316
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 1,316
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (1,316)
Net Amount
Total [Abstract]    
Gross Amounts of Financial Assets Recognized 4,445 6,225
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 4,445 6,225
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (4,236) (5,968)
Net Amount 209 257
Options [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 404 464
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 404 464
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (398) (451)
Net Amount 6 13
Warrants [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized  
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition  
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments)
Net Amount
Currency Forward Contracts [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 4 1
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 4 1
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments)
Net Amount $ 4 $ 1
[1] The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at December 31, 2018 and 2017.