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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 324 $ 222 $ 947 $ 643
United States [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] 202 158 599 460
International [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] 122 64 348 183
Commissions [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax 279 187 824 538
Market Data Fees [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 16 11 44 34
Risk Exposure Fees [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 3 4 8 13
Payments For Order Flow [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 6 5 20 16
Minimum Activity Fees [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 7 7 20 20
Others [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] $ 13 $ 8 $ 31 $ 22
[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.