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Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Offsetting Securities Loaned [Abstract]    
Gross Amounts of Financial Assets Recognized $ 5,738 $ 4,410
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 5,738 4,410
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (5,404) (4,186)
Net Amount 334 224
Securities Sold under Agreements to Repurchase [Abstract]    
Gross Amounts of Financial Assets Recognized   1,909
Amounts Offset in the Consolidated Statement of Financial Condition [1]  
Net Amounts Presented in the Consolidated Statement of Financial Condition   1,909
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments)   (1,909)
Net Amount  
Total [Abstract]    
Gross Amounts of Financial Assets Recognized 5,767 6,593
Amounts Offset in the Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Consolidated Statement of Financial Condition 5,767 6,593
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments) (5,430) (6,362)
Net Amount 337 231
Options [Member]    
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 27 273
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 27 273
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) (26) (267)
Net Amount 1 6
Currency Forward Contracts [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 [1]
Net Amounts Presented in the 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)
Net Amount $ 2 $ 1
[1] The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at September 30, 2020 and December 31, 2019.