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Fair Value Measurements - Fair Value Measurement (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Investments | $ 2,199 | $ 2,901
Derivative assets, net | 53 | 64
Assets | 2,252 | 2,965
Liabilities |  |
Securities sold, not yet purchased | 2,128 | 3,473
Derivative liabilities, net | 948 | 979
RFS obligations | 312 | 329
Liabilities | 3,388 | 4,781
Recurring measurement | Level 1 |  |
Assets |  |
Investments | 2,129 | 2,730
Assets | 2,129 | 2,730
Liabilities |  |
Securities sold, not yet purchased | 2,065 | 3,288
Liabilities | 2,065 | 3,288
Recurring measurement | Level 2 |  |
Assets |  |
Investments | 29 | 129
Derivative assets, net | 53 | 64
Assets | 82 | 193
Liabilities |  |
Securities sold, not yet purchased | 63 | 185
Derivative liabilities, net | 948 | 979
RFS obligations | 312 | 329
Liabilities | 1,323 | 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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