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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 365 $ 362 $ 767 $ 830
United States [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] 224 216 469 501
International [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] 141 146 298 329
Commissions [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 322 307 671 719
Market Data Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 19 20 39 39
Risk Exposure Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 6 7 21 12
Payments For Order Flow [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 9 9 19 19
Minimum Activity Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 1 9 2 16
Others [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] $ 8 $ 10 $ 15 $ 25
[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.