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Debt - Prime Notes (Details) - Prime Notes - Secured Debt - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Feb. 29, 2020 | Apr. 30, 2019 | Feb. 28, 2019 | Feb. 28, 2018 | Dec. 31, 2021
Debt Disclosure [Abstract] |  |  |  |  |
Debt instrument, face amount | $ 1,200 |  |  |  | $ 3,100
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount | 1,200 |  |  |  | $ 3,100
Repayments of debt | 1,300 | $ 1,100 | $ 319 | $ 649 |
Debt instrument, repurchased face amount | $ 1,200 | $ 1,000 | $ 300 | $ 594 |

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