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Financial Assets And Financial Liabilities (Netting of Financial Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Securities, Segregated For Regulatory Purposes, Purchased Under Agreements To Resell [Abstract]    
Gross Amounts of Financial Assets Recognized [1] $ 8,998 $ 9,166
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 8,998 9,166
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (8,998) (9,166)
Net Amount
Offsetting Securities Borrowed [Abstract]    
Gross Amounts of Financial Assets Recognized 3,588 2,957
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 3,588 2,957
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (3,451) (2,822)
Net Amount 137 135
Offsetting Securities Purchased under Agreements to Resell [Abstract]    
Gross Amounts of Financial Assets Recognized 533 2,035
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 533 2,035
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (533) (2,035)
Net Amount
Total [Abstract]    
Gross Amounts of Financial Assets Recognized 14,334 15,247
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 14,334 15,247
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (13,407) (14,474)
Net Amount 927 773
Options [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 1,207 1,052
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 1,207 1,052
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (425) (451)
Net Amount 782 601
Warrants And Discount Certificates [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 2 5
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 2 5
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments
Net Amount 2 5
Currency Forward Contracts [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 6 32
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 6 32
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments
Net Amount $ 6 $ 32
[1] As of June 30, 2018 and December 31, 2017, the Company had $9.0 billion and $9.2 billion, respectively, of securities purchased under agreements to resell that were segregated to satisfy regulatory requirements. These securities are included in "securities - segregated for regulatory purposes" in the condensed consolidated statements of financial condition.
[2] The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at June 30, 2018 and December 31, 2017.