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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 468 $ 307
United States [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 285 197
International [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 183 110
Commissions [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 412 269
Market Data Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 19 13
Risk Exposure Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 5 4
Payments For Order Flow [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 10 7
Minimum Activity Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 7 6
Others [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] $ 15 $ 8
[1] Based on the location of the subsidiaries in which the revenues are recorded.
[2] Included in other fees and services in the condensed consolidated statements of comprehensive income.