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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Recognized loss |  | $ 6 |  |
Cash received for partial settlement of call option |  | $ 27 | $ 578 | $ 623
Debt instrument, interest rate, stated percentage |  | 4.875% |  |
1.125% Convertible Notes | Convertible Debt |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Repayments of debt | $ 39 | $ 39 |  |
Current portion of long-term debt | $ 12 | $ 0 | $ 12 |
Debt instrument, interest rate, stated percentage | 1.125% | 1.125% | 1.125% |

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