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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 1,557 $ 1,506 $ 1,568
United States [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [1] 968 931 951
International [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [1] 589 575 617
Commissions [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 1,360 1,322 1,350
Market Data Fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [2] 70 76 78
Risk Exposure Fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [2] 46 33 38
Payments For Order Flow [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [2] 31 37 40
FDIC Sweep Fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [2] 19 10 6
Minimum Activity Fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [2] 4 3 18
Others [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [2] $ 27 $ 25 $ 38
[1] Based on the location of the subsidiaries in which the revenues are recorded.
[2] Included in other fees and services in the consolidated statements of comprehensive income.