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Financial Assets And Financial Liabilities (Netting of Financial Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Securities, Segregated For Regulatory Purposes, Purchased Under Agreements To Resell [Abstract]    
Gross Amounts of Financial Assets Recognized [1] $ 9,166 $ 10,995
Amounts Offset in the Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Consolidated Statement of Financial Condition 9,166 10,995
Amounts Not Offset in the Consolidated Statement of Financial Condition: Cash or Financial Instruments (9,166) (10,995)
Net Amount
Offsetting Securities Borrowed [Abstract]    
Gross Amounts of Financial Assets Recognized 2,957 3,629
Amounts Offset in the Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Consolidated Statement of Financial Condition 2,957 3,629
Amounts Not Offset in the Consolidated Statement of Financial Condition: Cash or Financial Instruments (2,822) (3,488)
Net Amount 135 141
Offsetting Securities Purchased under Agreements to Resell [Abstract]    
Gross Amounts of Financial Assets Recognized 2,035 111
Amounts Offset in the Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Consolidated Statement of Financial Condition 2,035 111
Amounts Not Offset in the Consolidated Statement of Financial Condition: Cash or Financial Instruments (2,035) (111)
Net Amount
Total [Abstract]    
Gross Amounts of Financial Assets Recognized 15,247 16,585
Amounts Offset in the Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Consolidated Statement of Financial Condition 15,247 16,585
Amounts Not Offset in the Consolidated Statement of Financial Condition: Cash or Financial Instruments (14,474) (15,825)
Net Amount 773 760
Options [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 1,052 1,804
Amounts Offset in the Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Consolidated Statement of Financial Condition 1,052 1,804
Amounts Not Offset in the Consolidated Statement of Financial Condition: Cash or Financial Instruments (451) (1,230)
Net Amount 601 574
Warrants And Discount Certificates [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 5 43
Amounts Offset in the Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Consolidated Statement of Financial Condition 5 43
Amounts Not Offset in the Consolidated Statement of Financial Condition: Cash or Financial Instruments (1)
Net Amount 5 42
Currency Forward Contracts [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 32 3
Amounts Offset in the Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Consolidated Statement of Financial Condition 32 3
Amounts Not Offset in the Consolidated Statement of Financial Condition: Cash or Financial Instruments
Net Amount $ 32 $ 3
[1] As of December 31, 2017 and December 31, 2016, the Company had $9.2 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 consolidated statements of financial condition.
[2] The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at December 31, 2017 and 2016.