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Financing Arrangements and Derivative Financial Instruments - Notes Narrative (Details) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 17, 2020 USD ($) | May 18, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 EUR (€) | Aug. 16, 2020 USD ($) | May 22, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, before deferred financing fees |  |  | $ 5,366,000,000 | $ 5,094,000,000 |  |  |  |
Repayments of long-term debt |  |  | 6,059,000,000 | 6,008,000,000 | $ 6,469,000,000 |  |  |
8.75% Due 2020 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, before deferred financing fees |  |  | $ 0 | $ 280,000,000 |  |  | $ 282,000,000 |
Interest rate, stated percentage |  |  | 8.75% | 8.75% |  | 8.75% | 8.75% |
Repayments of long-term debt | $ 282,000,000 |  |  |  |  |  |  |
5.125% due 2023 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, before deferred financing fees |  |  | $ 1,000,000,000 | $ 1,000,000,000 |  |  |  |
Interest rate, stated percentage |  |  | 5.125% | 5.125% |  | 5.125% |  |
Debt instrument, principal amount |  |  | $ 1,000,000,000.0 |  |  |  |  |
Notes sold, percentage of principle amount |  |  | 100.00% |  |  | 100.00% |  |
Debt instrument, maturity date |  |  | Nov. 15, 2023 |  |  |  |  |
Debt instrument, redemption price |  |  | 100.00% |  |  |  |  |
3.75% Euro Notes due 2023 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  | 3.75% |  |  | 3.75% |  |
Debt instrument, principal amount | € |  |  |  |  |  | € 250,000,000 |  |
Notes sold, percentage of principle amount |  |  | 100.00% |  |  | 100.00% |  |
Debt instrument, maturity date |  |  | Dec. 15, 2023 |  |  |  |  |
Debt instrument, redemption price |  |  | 100.00% |  |  |  |  |
9.5% due 2025 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, before deferred financing fees |  |  | $ 803,000,000 | $ 0 |  |  |  |
Interest rate, stated percentage |  | 9.50% | 9.50% | 9.50% |  | 9.50% |  |
Debt instrument, principal amount |  | $ 600,000,000 | $ 800,000,000 |  |  |  |  | $ 200,000,000
Notes sold, percentage of principle amount |  | 100.00% |  |  |  |  |  | 101.75%
Debt instrument, maturity date |  | May 31, 2025 |  |  |  |  |  |
Effective yield |  |  |  |  |  |  |  | 9.056%
Debt redemption, potential percentage of principal amount from equity offerings |  |  | 35.00% |  |  |  |  |
Debt redemption, redemption price from equity offerings |  |  | 109.50% |  |  |  |  |
9.5% due 2025 | Senior Notes | Period Commencing May 31, 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price |  |  | 104.75% |  |  |  |  |
9.5% due 2025 | Senior Notes | Period Commencing May 31, 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price |  |  | 102.375% |  |  |  |  |
9.5% due 2025 | Senior Notes | Period Commencing May 31, 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price |  |  | 100.00% |  |  |  |  |
9.5% due 2025 | Senior Notes | Period Prior to May 31, 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price |  |  | 100.00% |  |  |  |  |
5% due 2026 | Period Commencing May 31, 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price |  |  | 101.667% |  |  |  |  |
5% due 2026 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, before deferred financing fees |  |  | $ 900,000,000 | $ 900,000,000 |  |  |  |
Interest rate, stated percentage |  |  | 5.00% | 5.00% |  | 5.00% |  |
Debt instrument, principal amount |  |  | $ 900,000,000 |  |  |  |  |
Notes sold, percentage of principle amount |  |  | 100.00% |  |  | 100.00% |  |
Debt instrument, maturity date |  |  | May 31, 2026 |  |  |  |  |
5% due 2026 | Senior Notes | Period Commencing May 31, 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price |  |  | 100.833% |  |  |  |  |
5% due 2026 | Senior Notes | Period Commencing May 31, 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price |  |  | 100.00% |  |  |  |  |
5% due 2026 | Senior Notes | Period Commencing May 31, 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price |  |  | 102.50% |  |  |  |  |
5% due 2026 | Senior Notes | Period Prior to May 31, 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price |  |  | 100.00% |  |  |  |  |
4.875% due 2027 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, before deferred financing fees |  |  | $ 700,000,000 | $ 700,000,000 |  |  |  |
Interest rate, stated percentage |  |  | 4.875% | 4.875% |  | 4.875% |  |
Debt instrument, principal amount |  |  | $ 700,000,000 |  |  |  |  |
Notes sold, percentage of principle amount |  |  | 100.00% |  |  | 100.00% |  |
Debt instrument, maturity date |  |  | Mar. 15, 2027 |  |  |  |  |
Basis spread |  |  | 0.50% |  |  |  |  |
4.875% due 2027 | Senior Notes | Debt Instrument, Redemption, Prior to December 15, 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price |  |  | 100.00% |  |  |  |  |
4.875% due 2027 | Senior Notes | Debt Instrument, Redemption, After December 15, 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price |  |  | 100.00% |  |  |  |  |
7% due 2028 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, before deferred financing fees |  |  | $ 150,000,000 | $ 150,000,000 |  |  |  |
Interest rate, stated percentage |  |  | 7.00% | 7.00% |  | 7.00% |  |
Debt instrument, principal amount |  |  | $ 150,000,000 |  |  |  |  |
Debt instrument, maturity date |  |  | Mar. 15, 2028 |  |  |  |  |
Basis spread |  |  | 0.15% |  |  |  |  |
7% due 2028 | Senior Notes | Debt Instrument, Redemption, Prior to December 15, 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price |  |  | 100.00% |  |  |  |  |

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