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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | $ 592 | $ 438
United States [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | 362 | 272
International [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | 230 | 166
Commissions [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 514 | 379
Market Data Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | 19 | 17
Risk Exposure Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | 28 | 19
Payments For Order Flow [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | 13 | 10
FDIC Sweep Fees [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | 8 | 6
Others [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | $ 10 | $ 7
[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.

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