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Segment Reporting And Geographic Information (Segment Table) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Total net revenues $ 1,427 $ 1,203  
Transaction based fees [1] 102 80  
Non-transaction based fees [1] 19 21  
Employee compensation [2] 143 133  
Advertising [3] 21 13  
Other expenses [4] 87 90  
Total non-interest expenses 372 337  
Income before income taxes 1,055 866  
Income tax expense 91 71  
Net income 964 795  
Assets 157,670   $ 150,142
Depreciation and amortization [5] 15 17  
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Assets $ 157,670 $ 132,238  
[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.