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Fair Value Measurements - Long-Term Debt (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | $ 2,129 | $ 2,127
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | $ 2,246 | 2,276
Senior notes | 4.375% Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument, interest rate, stated percentage | 4.375% |
Senior notes | 4.375% Notes | Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | $ 790 | 789
Senior notes | 4.375% Notes | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | $ 835 | 843
Senior notes | 5.375% Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument, interest rate, stated percentage | 5.375% |
Senior notes | 5.375% Notes | Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | $ 698 | 697
Senior notes | 5.375% Notes | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | $ 733 | 742
Senior notes | 3.875% Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt instrument, interest rate, stated percentage | 3.875% |
Senior notes | 3.875% Notes | Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | $ 641 | 641
Senior notes | 3.875% Notes | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | $ 678 | $ 691

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