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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 307 $ 208
United States [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 197 148
International [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 110 60
Commissions [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax 269 173
Market Data Fees [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 13 12
Risk Exposure Fees [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 4 4
Payments For Order Flow [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 7 5
Minimum Activity Fees [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 6 7
Others [Member]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] $ 8 $ 7
[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.