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Fair Value Measurements - Fair Value Measurement (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Liabilities |  |  |
Securities sold, not yet purchased | $ 4,231 |  | $ 2,521
Derivative liabilities, net | 754 |  | 639
Level 3 |  |  |
Liabilities |  |  |
Investments increased | 1 | $ 0 |
Recurring measurement |  |  |
Assets |  |  |
Investments | 10,773 |  | 8,761
Derivative assets, net | 683 |  | 785
Assets, Fair Value Disclosure | 11,456 |  | 9,546
Liabilities |  |  |
Securities sold, not yet purchased | 4,231 |  | 2,521
Derivative liabilities, net | 754 |  | 639
Other liabilities | 485 |  | 214
Liabilities, Fair Value Disclosure | 5,470 |  | 3,374
Recurring measurement | Level 1 |  |  |
Assets |  |  |
Investments | 10,616 |  | 8,546
Assets, Fair Value Disclosure | 10,616 |  | 8,546
Liabilities |  |  |
Securities sold, not yet purchased | 4,231 |  | 2,521
Derivative liabilities, net |  |  | 11
Liabilities, Fair Value Disclosure | 4,231 |  | 2,532
Recurring measurement | Level 2 |  |  |
Assets |  |  |
Investments | 115 |  | 174
Derivative assets, net | 683 |  | 785
Assets, Fair Value Disclosure | 798 |  | 959
Liabilities |  |  |
Derivative liabilities, net | 754 |  | 628
Other liabilities | 485 |  | 214
Liabilities, Fair Value Disclosure | 1,239 |  | 842
Recurring measurement | Level 3 |  |  |
Assets |  |  |
Investments | 42 |  | 41
Assets, Fair Value Disclosure | $ 42 |  | $ 41

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