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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 316 $ 213 $ 623 $ 421
United States [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] 200 154 397 302
International [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] 116 59 226 119
Commissions [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 276 178 545 351
Market Data Fees [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 15 11 28 23
Risk Exposure Fees [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 1 5 5 9
Payments For Order Flow [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 7 6 14 11
Minimum Activity Fees [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 7 6 13 13
Others [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] $ 10 $ 7 $ 18 $ 14
[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.