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Fair Value Measurements - Fair Value Measurement (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets [Abstract] |  |
Derivative contracts, at fair value (asset) | $ 785 | $ 182
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 2,521 | 1,190
Derivative contracts, at fair value (liability) | 639 | 1,224
Recurring measurement |  |
Assets [Abstract] |  |
Investments | 8,761 | 9,732
Derivative contracts, at fair value (asset) | 785 | 182
Assets, Fair Value Disclosure | 9,546 | 9,914
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 2,521 | 1,190
Derivative contracts, at fair value (liability) | 639 | 1,224
Other liabilities | 214 | 13
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 3,374 | 2,427
Recurring measurement | Level 1 |  |
Assets [Abstract] |  |
Investments | 8,546 | 9,448
Assets, Fair Value Disclosure | 8,546 | 9,448
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 2,521 | 1,190
Derivative contracts, at fair value (liability) | 11 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 2,532 | 1,190
Recurring measurement | Level 2 |  |
Assets [Abstract] |  |
Investments | 174 | 281
Derivative contracts, at fair value (asset) | 785 | 182
Assets, Fair Value Disclosure | 959 | 463
Liabilities [Abstract] |  |
Derivative contracts, at fair value (liability) | 628 | 1,224
Other liabilities | 214 | 7
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 842 | 1,231
Recurring measurement | Level 3 |  |
Assets [Abstract] |  |
Investments | 41 | 3
Assets, Fair Value Disclosure | $ 41 | 3
Liabilities [Abstract] |  |
Other liabilities |  | 6
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | $ 6

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