v3.25.2
Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 578 $ 474 $ 1,170 $ 912
United States [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] 351 296 713 568
International [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [1] 227 178 457 344
Commissions [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 516 406 1,030 785
Market Data Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 20 18 39 35
Risk Exposure Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 17 24 45 43
Payments For Order Flow [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 9 10 22 20
FDIC Sweep Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] 9 7 17 13
Others [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax [2] $ 7 $ 9 $ 17 $ 16
[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.