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Fair Value Measurements - Fair Value Measurement (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Derivative assets, net | $ 22 | $ 64
Liabilities |  |
Securities sold, not yet purchased | 1,373 | 3,473
Derivative liabilities, net | 756 | 979
Recurring measurement |  |
Assets |  |
Investments | 2,275 | 2,901
Derivative assets, net | 22 | 64
Assets | 2,297 | 2,965
Liabilities |  |
Securities sold, not yet purchased | 1,373 | 3,473
Derivative liabilities, net | 756 | 979
Other liabilities | 323 | 329
Liabilities | 2,452 | 4,781
Recurring measurement | Level 1 |  |
Assets |  |
Investments | 2,203 | 2,730
Assets | 2,203 | 2,730
Liabilities |  |
Securities sold, not yet purchased | 1,153 | 3,288
Derivative liabilities, net | 6 |
Liabilities | 1,159 | 3,288
Recurring measurement | Level 2 |  |
Assets |  |
Investments | 31 | 129
Derivative assets, net | 22 | 64
Assets | 53 | 193
Liabilities |  |
Securities sold, not yet purchased | 220 | 185
Derivative liabilities, net | 750 | 979
Other liabilities | 323 | 329
Liabilities | 1,293 | 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 | $ 7 |

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