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Segment Reporting And Geographic Information (Segment Table) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Total net revenues $ 1,655 $ 1,365 $ 4,562 $ 3,798  
Transaction based fees [1] 71 95 267 270  
Non-transaction based fees [1] 21 21 62 62  
Employee compensation [2] 145 133 430 398  
Advertising [3] 27 16 74 47  
Other expenses [4] 79 191 258 366  
Total non-interest expenses 343 456 1,091 1,143  
Income before income taxes 1,312 909 3,471 2,655  
Income tax expense 126 75 315 217  
Net income 1,186 834 3,156 2,438  
Assets 200,222   200,222   $ 150,142
Depreciation and amortization [5] 15 17 45 51  
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Assets $ 200,222 $ 148,526 $ 200,222 $ 148,526  
[1] Included in “Execution, clearing and distribution fees” in the condensed consolidated statements of comprehensive income.
[2] Included in “Employee compensation and benefits” in the condensed consolidated statements of comprehensive income.
[3] Included in “General and administrative” in the condensed consolidated statements of comprehensive income.
[4] Includes “Occupancy, depreciation and amortization”; “Communications”; “Customer bad debt”; employee benefits and other personnel expenses included in “Employee compensation and benefits”; and professional services, legal and regulatory matters, and other administrative expenses included in “General and administrative” in the condensed consolidated statements of comprehensive income.
[5] Included in “Occupancy, depreciation and amortization” in the condensed consolidated statements of comprehensive income.