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Debt Debt (Narrative) (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 25, 2020 | Aug. 11, 2020 | Mar. 31, 2020
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Amount arranged |  |  | $ 500,000,000.0 | $ 500,000,000.0 |
Borrowings outstanding | $ 0 |  |  |  |
Liabilities Subject to Compromise | 7,313,700,000 | $ 7,313,700,000 |  |  | $ 7,313,700,000
Letters of credit outstanding, amount | 116,600,000 |  |  |  |
Accrued Interest on Senior Notes, Exchangeable Senior Notes, Debentures and Revolving Credit Facility | 203,500,000 | 203,500,000 |  |  |
Line of Credit Facility, Current Borrowing Capacity | 1,600,000,000 |  |  |  |
Reported Value Measurement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Liabilities Subject to Compromise | 7,096,300,000 | 7,096,300,000 |  |  |
Long-term Debt | 7,096,300,000 | 7,096,300,000 |  |  |
Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding | 581,000,000.0 |  |  |  |
Letters of credit outstanding, amount | 26,000,000.0 | 27,000,000.0 |  |  |
Senior Notes | Reported Value Measurement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Liabilities Subject to Compromise | 6,500,000,000 | 6,500,000,000 |  |  |
Accrued Interest on Senior Notes, Exchangeable Senior Notes, Debentures and Revolving Credit Facility | 201,900,000 | 201,900,000 |  |  |
Convertible Debt [Member] | Three percent exchangeable senior notes due twenty twenty four [Member] | Reported Value Measurement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt | $ 849,500,000 | $ 849,500,000 |  |  |

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