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Fair Value Measurements - Fair Value Measurement (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Derivative assets, net | $ 24 | $ 64
Liabilities |  |
Securities sold, not yet purchased | 3,644 | 3,473
Derivative liabilities, net | 702 | 979
Recurring measurement |  |
Assets |  |
Investments | 3,206 | 2,901
Derivative assets, net | 24 | 64
Assets | 3,230 | 2,965
Liabilities |  |
Securities sold, not yet purchased | 3,644 | 3,473
Derivative liabilities, net | 702 | 979
RFS obligations | 294 | 329
Liabilities | 4,640 | 4,781
Recurring measurement | Level 1 |  |
Assets |  |
Investments | 3,105 | 2,730
Assets | 3,105 | 2,730
Liabilities |  |
Securities sold, not yet purchased | 3,469 | 3,288
Liabilities | 3,469 | 3,288
Recurring measurement | Level 2 |  |
Assets |  |
Investments | 60 | 129
Derivative assets, net | 24 | 64
Assets | 84 | 193
Liabilities |  |
Securities sold, not yet purchased | 175 | 185
Derivative liabilities, net | 702 | 979
RFS obligations | 294 | 329
Liabilities | 1,171 | 1,493
Recurring measurement | Level 3 |  |
Assets |  |
Investments | 41 | 42
Assets | 41 | $ 42
Fair value, nonrecurring | Level 3 |  |
Liabilities |  |
Estimated fair value | 46 |
Fair value of related party note receivable | $ 11 |

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