Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles - Principles of Consolidation and Basis of Presentation (Details)

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Summary of Significant Accounting Principles - Principles of Consolidation and Basis of Presentation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Market making and similar activities $ 9,034 $ 9,008 $ 7,102
Restatement Adjustment      
Disaggregation of Revenue [Line Items]      
Market making and similar activities $ 930 $ 1,100 $ 332