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Long-Term Debt and Finance Lease Obligations - 2025 Notes and 2028 Notes (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 27, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |
Net cash proceeds received |  | $ 1,000,000,000 | $ 0 | $ 0
2025 and 2028 Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Net cash proceeds received | $ 993,000,000 |  |  |
Debt issuance costs | 7,000,000 |  |  |
2025 Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount | $ 600,000,000 |  |  |
Stated interest rate | 5.25% |  |  |
Minimum percentage of notes held in order to cause acceleration of notes upon occurrence of events of default | 25.00% |  |  |
2028 Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount | $ 400,000,000 |  |  |
Stated interest rate | 5.75% |  |  |
Minimum percentage of notes held in order to cause acceleration of notes upon occurrence of events of default | 25.00% |  |  |

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