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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 402 $ 468
United States [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 245 285
International [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [1] 157 183
Commissions [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 349 412
Market Data Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 20 19
Risk Exposure Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 15 5
Payments For Order Flow [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 10 10
Minimum Activity Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] 1 7
Others [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax [2] $ 7 $ 15
[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.