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Fair Value Measurements - Fair Value Measurement (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Derivative contracts, at fair value | $ 855 | $ 785
Liabilities |  |
Securities sold, not yet purchased | 4,863 | 2,521
Derivative contracts at fair value | 584 | 639
Recurring measurement |  |
Assets |  |
Investments | 11,340 | 8,761
Derivative contracts, at fair value | 855 | 785
Assets, Fair Value Disclosure | 12,195 | 9,546
Liabilities |  |
Securities sold, not yet purchased | 4,863 | 2,521
Derivative contracts at fair value | 584 | 639
Other liabilities | 342 | 214
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 5,789 | 3,374
Recurring measurement | Level 1 |  |
Assets |  |
Investments | 11,128 | 8,546
Assets, Fair Value Disclosure | 11,128 | 8,546
Liabilities |  |
Securities sold, not yet purchased | 4,863 | 2,521
Derivative contracts at fair value |  | 11
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 4,863 | 2,532
Recurring measurement | Level 2 |  |
Assets |  |
Investments | 171 | 174
Derivative contracts, at fair value | 855 | 785
Assets, Fair Value Disclosure | 1,026 | 959
Liabilities |  |
Derivative contracts at fair value | 584 | 628
Other liabilities | 342 | 214
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 926 | 842
Recurring measurement | Level 3 |  |
Assets |  |
Investments | 41 | 41
Assets, Fair Value Disclosure | $ 41 | $ 41

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