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Fair Value Measurements - Fair Value Measurement (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets [Abstract] |  |
Derivative contracts, at fair value (asset) | $ 1,927 | $ 182
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 1,819 | 1,190
Derivative contracts at fair value (liability) | 142 | 1,224
Recurring measurement |  |
Assets [Abstract] |  |
Investments | 9,293 | 9,732
Derivative contracts, at fair value (asset) | 1,927 | 182
Assets, Fair Value Disclosure | 11,220 | 9,914
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 1,819 | 1,190
Other liabilities | 15 | 13
Derivative contracts at fair value (liability) | 142 | 1,224
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 1,976 | 2,427
Recurring measurement | Level 1 |  |
Assets [Abstract] |  |
Investments | 9,057 | 9,448
Derivative contracts, at fair value (asset) | 0 | 0
Assets, Fair Value Disclosure | 9,057 | 9,448
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 1,819 | 1,190
Other liabilities | 0 | 0
Derivative contracts at fair value (liability) | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 1,819 | 1,190
Recurring measurement | Level 2 |  |
Assets [Abstract] |  |
Investments | 233 | 281
Derivative contracts, at fair value (asset) | 1,927 | 182
Assets, Fair Value Disclosure | 2,160 | 463
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 0 | 0
Other liabilities | 12 | 7
Derivative contracts at fair value (liability) | 142 | 1,224
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 154 | 1,231
Recurring measurement | Level 3 |  |
Assets [Abstract] |  |
Investments | 3 | 3
Derivative contracts, at fair value (asset) | 0 | 0
Assets, Fair Value Disclosure | 3 | 3
Liabilities [Abstract] |  |
Securities sold, not yet purchased, at fair value | 0 | 0
Other liabilities | 3 | 6
Derivative contracts at fair value (liability) | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 3 | $ 6

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