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Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Offsetting Securities Loaned [Abstract]    
Gross Amounts of Financial Assets Recognized $ 4,444 $ 4,293
Amounts Offset in the Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Consolidated Statement of Financial Condition 4,444 4,293
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments) (4,201) (4,158)
Net Amount 243 135
Securities Sold under Agreements to Repurchase [Abstract]    
Gross Amounts of Financial Assets Recognized 1,316  
Amounts Offset in the Consolidated Statement of Financial Condition [1]  
Net Amounts Presented in the Consolidated Statement of Financial Condition 1,316  
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments) (1,316)  
Net Amount  
Total [Abstract]    
Gross Amounts of Financial Assets Recognized 6,225 5,599
Amounts Offset in the Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Consolidated Statement of Financial Condition 6,225 5,599
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments) (5,968) (5,389)
Net Amount 257 210
Options [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 464 1,286
Amounts Offset in the Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Consolidated Statement of Financial Condition 464 1,286
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments) (451) (1,230)
Net Amount 13 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 Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Consolidated Statement of Financial Condition 1
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments) (1)
Net Amount
Currency Forward Contracts [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 1 19
Amounts Offset in the Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Consolidated Statement of Financial Condition 1 19
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments)
Net Amount $ 1 $ 19
[1] The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at December 31, 2017 and 2016.