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STATEMENTS OF CONSOLIDATED CASH FLOWS (Parenthetical) | Dec. 31, 2021 | May 31, 2021 | Dec. 31, 2020 | May 01, 2020 | Apr. 28, 2020 | Dec. 31, 2019 | Nov. 26, 2019 | May 15, 2016
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5.875% Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Debt instrument contractual rate (percent) |  |  |  |  |  | 5.875% |  | 5.875%
4.50% Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Debt instrument contractual rate (percent) | 4.50% | 4.50% |  |  |  |  |  |
4.625% Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Debt instrument contractual rate (percent) |  |  |  |  |  | 4.625% | 4.625% |
6.50% Senior Notes |  |  |  |  |  |  |  |
Debt instrument contractual rate (percent) |  |  |  | 6.50% | 6.50% |  |  |
6.50% Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Debt instrument contractual rate (percent) | 6.50% |  | 6.50% |  |  |  |  |

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