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Debt - Conversion (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Debt repurchased amount |  | $ 160 |
Senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt repurchased amount |  | $ 160 |
Senior notes | 6.625% senior notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 6.625% |
Notes | $ 229 |  |
Debt repurchased amount |  | $ 32 |
Senior notes | 6.875% senior notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 6.875% |
Notes | 134 |  |
Debt repurchased amount |  | $ 20 |
Senior notes | 4.875% senior notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 4.875% |
Debt repurchased amount |  | $ 66 |
Senior notes | 5.75% senior notes due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 5.75% |
Debt repurchased amount |  | $ 42 |
Senior notes | 7.00% senior notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 7.00% | 7.00%
Notes | 226 |  |
Senior notes | 8.00% senior notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Notes | 999 |  |
Senior notes | 8.00% senior notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 8.00% |
Notes | 873 |  |
Senior notes | 7.5% senior notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 7.50% | 7.50%
Notes | 281 |  |
Senior notes | 8.00% senior notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 8.00% |
Notes | 837 |  |
Senior notes | 6.125% senior notes due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 6.125% |
Notes | 381 |  |
Senior notes | 5.375% senior notes due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  | 5.375% |
Notes | 140 |  |
Senior notes | 7.00% Senior Notes Due 2024, 8.00% Senior Notes Due 2025, 8.00% Senior Notes Due 2026, 7.5% Senior Notes Due 2026, and 8.00% Senior Notes Due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Notes | 3,216 |  |
Senior notes | 6.625% Senior Notes Due 2020, 6.875% Senior Notes Due 2020, 6.125% Senior Notes Due 2021, And 5.375% Senior Notes Due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Notes | $ 884 |  |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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