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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 1,977 $ 1,557 $ 1,506
United States [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [1] 1,230 968 931
International [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [1] 747 589 575
Commissions [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 1,697 1,360 1,322
Market Data Fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [2] 71 70 76
Risk Exposure Fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [2] 100 46 33
Payments For Order Flow [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [2] 45 31 37
FDIC Sweep Fees [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [2] 28 19 10
Others [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax [2] $ 36 $ 31 $ 28
[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.