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Financial Assets And Financial Liabilities (Netting of Financial Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Securities, Segregated For Regulatory Purposes, Purchased Under Agreements To Resell [Abstract]    
Gross Amounts of Financial Assets Recognized [1] $ 13,774 $ 10,995
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 13,774 10,995
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (13,774) (10,995)
Offsetting Securities Borrowed [Abstract]    
Gross Amounts of Financial Assets Recognized 3,895 3,629
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 3,895 3,629
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (3,750) (3,488)
Net Amount 145 141
Offsetting Securities Purchased under Agreements to Resell [Abstract]    
Gross Amounts of Financial Assets Recognized 366 111
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 366 111
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (366) (111)
Total [Abstract]    
Gross Amounts of Financial Assets Recognized 19,036 16,585
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 19,036 16,585
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (18,235) (15,825)
Net Amount 801 760
Options [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 973 1,804
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 973 1,804
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (345) (1,230)
Net Amount 628 574
Warrants And Discount Certificates [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 3 43
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 3 43
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments   (1)
Net Amount 3 42
Currency Forward Contracts [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 25 3
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition 25 3
Net Amount $ 25 $ 3
[1] As of June 30, 2017 and December 31, 2016, the Company had $13.8 billion and $11.0 billion, respectively, of securities purchased under agreements to resell that were segregated to satisfy regulatory requirements. These securities are included in "Cash and 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, 2017 and December 31, 2016.