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Financial Assets And Financial Liabilities (Netting of Financial Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Securities, Segregated For Regulatory Purposes, Purchased Under Agreements To Resell [Abstract]    
Gross Amounts of Financial Assets Recognized [1] $ 14,629 $ 11,382
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 14,629 11,382
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (14,629) (11,382)
Net Amount
Offsetting Securities Borrowed [Abstract]    
Gross Amounts of Financial Assets Recognized 4,196 3,331
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 4,196 3,331
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (4,025) (3,199)
Net Amount 171 132
Offsetting Securities Purchased under Agreements to Resell [Abstract]    
Gross Amounts of Financial Assets Recognized 1,580 1,242
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 1,580 1,242
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (1,580) (1,242)
Net Amount
Total [Abstract]    
Gross Amounts of Financial Assets Recognized 21,052 17,463
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 21,052 17,463
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (20,274) (16,221)
Net Amount 778 1,242
Options [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 644 1,479
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 644 1,479
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (40) (398)
Net Amount 604 1,081
Warrants [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 1 1
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 1 1
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments
Net Amount 1 1
Currency Forward Contracts [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 2 28
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 2 28
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments
Net Amount $ 2 $ 28
[1] As of March 31, 2019 and December 31, 2018, the Company had $14.6 billion and $11.4 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 March 31, 2019 and December 31, 2018.