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Fair Value Measurements - Fair Value Measurement (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Assets [Abstract] |  |
Derivative contracts, at fair value (asset) | $ 612 | $ 785
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 5,340 | 2,521
Derivative contracts, at fair value (liability) | 787 | 639
Recurring measurement |  |
Assets [Abstract] |  |
Investments | 9,060 | 8,761
Derivative contracts, at fair value (asset) | 612 | 785
Assets, Fair Value Disclosure | 9,672 | 9,546
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 5,340 | 2,521
Derivative contracts, at fair value (liability) | 787 | 639
Other liabilities | 494 | 214
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 6,621 | 3,374
Recurring measurement | Level 1 |  |
Assets [Abstract] |  |
Investments | 8,905 | 8,546
Assets, Fair Value Disclosure | 8,905 | 8,546
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 5,340 | 2,521
Derivative contracts, at fair value (liability) |  | 11
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 5,340 | 2,532
Recurring measurement | Level 2 |  |
Assets [Abstract] |  |
Investments | 113 | 174
Derivative contracts, at fair value (asset) | 612 | 785
Assets, Fair Value Disclosure | 725 | 959
Liabilities [Abstract] |  |
Derivative contracts, at fair value (liability) | 787 | 628
Other liabilities | 494 | 214
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 1,281 | 842
Recurring measurement | Level 3 |  |
Assets [Abstract] |  |
Investments | 42 | 41
Assets, Fair Value Disclosure | $ 42 | $ 41

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