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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | $ 507 | $ 385 | $ 1,419 | $ 1,154
United States [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | 317 | 239 | 885 | 714
International [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | 190 | 146 | 534 | 440
Commissions [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 435 | 333 | 1,220 | 1,012
Market Data Fees [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | 18 | 17 | 53 | 53
Risk Exposure Fees [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | 26 | 13 | 69 | 29
Payments For Order Flow [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | 12 | 8 | 32 | 23
FDIC Sweep Fees [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | 7 | 5 | 20 | 13
Others [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [2] | $ 9 | $ 9 | $ 25 | $ 24
[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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