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Fair Value Measurements - Fair Value Measurement (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Assets [Abstract] |  |
Derivative contracts, at fair value (asset) | $ 469 | $ 612
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 4,776 | 5,340
Derivative contracts, at fair value (liability) | 729 | 787
Recurring measurement |  |
Assets [Abstract] |  |
Investments | 7,307 | 9,060
Derivative contracts, at fair value (asset) | 469 | 612
Assets, Fair Value Disclosure | 7,776 | 9,672
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 4,776 | 5,340
Derivative contracts, at fair value (liability) | 729 | 787
Other liabilities | 585 | 494
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 6,090 | 6,621
Recurring measurement | Level 1 |  |
Assets [Abstract] |  |
Investments | 7,154 | 8,905
Assets, Fair Value Disclosure | 7,154 | 8,905
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 4,776 | 5,340
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 4,776 | 5,340
Recurring measurement | Level 2 |  |
Assets [Abstract] |  |
Investments | 111 | 113
Derivative contracts, at fair value (asset) | 469 | 612
Assets, Fair Value Disclosure | 580 | 725
Liabilities [Abstract] |  |
Derivative contracts, at fair value (liability) | 729 | 787
Other liabilities | 585 | 494
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 1,314 | 1,281
Recurring measurement | Level 3 |  |
Assets [Abstract] |  |
Investments | 42 | 42
Assets, Fair Value Disclosure | $ 42 | $ 42

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