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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 369 $ 365 $ 769 $ 767
United States [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] 242 224 475 469
International [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] 127 141 294 298
Commissions [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 322 322 679 671
Market Data Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 18 19 36 39
Risk Exposure Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 10 6 16 21
Payments For Order Flow [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 7 9 15 19
Others [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] $ 12 $ 9 $ 23 $ 17
[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.