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Financial Assets And Financial Liabilities (Netting of Financial Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Securities, Segregated For Regulatory Purposes, Purchased Under Agreements To Resell [Abstract]    
Gross Amounts of Financial Assets Recognized [1] $ 8,734 $ 9,166
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 8,734 9,166
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (8,734) (9,166)
Net Amount
Offsetting Securities Borrowed [Abstract]    
Gross Amounts of Financial Assets Recognized 3,551 2,957
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 3,551 2,957
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (3,375) (2,822)
Net Amount 176 135
Offsetting Securities Purchased under Agreements to Resell [Abstract]    
Gross Amounts of Financial Assets Recognized 331 2,035
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 331 2,035
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (331) (2,035)
Net Amount
Total [Abstract]    
Gross Amounts of Financial Assets Recognized 14,336 15,247
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 14,336 15,247
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (13,117) (14,474)
Net Amount 1,219 773
Options [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized 1,720 1,052
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition 1,720 1,052
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments (677) (451)
Net Amount 1,043 601
Warrants [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized   5
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition   5
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments
Net Amount 5
Currency Forward Contracts [Member]    
Offsetting Financial Instruments Owned, At Fair Value [Abstract]    
Gross Amounts of Financial Assets Recognized   32
Amounts Offset in the Condensed Consolidated Statement of Financial Condition [2]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition   32
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments
Net Amount $ 32
[1] As of September 30, 2018 and December 31, 2017, the Company had $8.7 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 September 30, 2018 and December 31, 2017.