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Debt - Debt Issuances and Retirements (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 17, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, principal | $ 8,916,000,000 | $ 9,095,000,000 | $ 9,095,000,000 | $ 8,916,000,000 |  |  |
Gains (losses) on purchases or exchanges of debt |  |  | 65,000,000 | 79,000,000 | $ 263,000,000 |  |
Debt repurchased amount |  | 160,000,000 | 160,000,000 |  |  |  |
Cash paid to purchase debt |  |  | 94,000,000 | 1,073,000,000 | 2,813,000,000 |  |
Deferred charges | $ 44,000,000 | 0 | 0 | 44,000,000 |  |  |
Gains (losses) on debt restructuring |  |  | 65,000,000 | 75,000,000 | 263,000,000 |  |
Chesapeake senior notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Gains (losses) on purchases or exchanges of debt |  | 64,000,000 |  |  |  |  |
6.625% Senior Notes Due 2020, 4.875% Senior Notes Due 2022, and 5.75% Senior Notes Due 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, principal |  | 101,000,000 | 101,000,000 |  |  |  |
BVL Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Gains (losses) on purchases or exchanges of debt |  |  |  | $ 4,000,000 |  |  |
Existing Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes |  |  | 3,152,000,000 |  |  |  |
Second Lien Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes |  |  | 2,210,000,000 |  |  |  |
11.5% Senior Secured Second Lien Notes Due 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, principal |  | $ 120,000,000 | $ 120,000,000 |  |  |  |
Debt, percent of par | 89.75% |  |  |  |  |  |
Interest rate, stated percentage |  | 11.50% | 11.50% |  |  |  |
Senior notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percentage of principal amount redeemed |  |  | 100.00% | 35.00% |  |  |
Redemption price percentage |  |  | 35.00% | 100.00% |  |  |
Repayments of senior debt |  | $ 380,000,000 |  |  |  |  |
Debt repurchased amount |  | 160,000,000 | $ 160,000,000 |  |  |  |
Gains (losses) on repurchases of debt |  |  | 65,000,000 |  |  |  |
Senior notes | 7.00% senior notes due 2024 and 7.50% senior notes due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from debt, net |  |  |  |  | 1,236,000,000 |  |
Senior notes | 7.00% senior notes due 2024 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, principal | $ 624,000,000 | $ 624,000,000 | $ 624,000,000 | $ 624,000,000 | $ 850,000,000 |  |
Interest rate, stated percentage |  | 7.00% | 7.00% |  | 7.00% |  |
Notes |  |  |  | 226,000,000 |  |  |
Senior notes | 7.5% senior notes due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, principal | 119,000,000 | $ 119,000,000 | $ 119,000,000 | 119,000,000 | $ 400,000,000 |  |
Interest rate, stated percentage |  | 7.50% | 7.50% |  | 7.50% |  |
Notes |  |  |  | 281,000,000 |  |  |
Senior notes | 8.00% senior secured second lien notes due 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, principal | 1,416,000,000 |  |  | 1,416,000,000 |  |  |
Interest rate, stated percentage |  | 8.00% | 8.00% |  |  |  |
Debt repurchased amount |  | $ 1,477,000,000 | $ 1,477,000,000 |  |  |  |
Premium |  |  |  |  |  | $ 60,000,000 |
Gains (losses) on repurchases of debt |  |  |  |  |  | 331,000,000 |
Gains (losses) on debt restructuring |  |  |  |  |  | $ 391,000,000 |
Senior notes | 7.25% senior notes due 2018 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage |  | 7.25% | 7.25% |  |  |  |
Debt repurchased amount |  | $ 44,000,000 | $ 44,000,000 |  |  |  |
Senior notes | Chesapeake senior notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit facility |  | $ 507,000,000 | 507,000,000 |  |  |  |
Conversation of common stock shares outstanding (in shares) |  | 235,563,519 |  |  |  |  |
Senior notes | 8.00% senior notes due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, principal | 46,000,000 | $ 46,000,000 | $ 46,000,000 | 46,000,000 |  |  |
Interest rate, stated percentage |  | 8.00% | 8.00% |  |  |  |
Notes |  |  |  | 873,000,000 |  |  |
Revolving credit facility |  | $ 919,000,000 | $ 919,000,000 |  |  |  |
Senior notes | 6.625% senior notes due 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, principal | 208,000,000 | $ 176,000,000 | $ 176,000,000 | 208,000,000 |  |  |
Interest rate, stated percentage |  | 6.625% | 6.625% |  |  |  |
Notes |  |  |  | 229,000,000 |  |  |
Debt repurchased amount |  | $ 32,000,000 | $ 32,000,000 |  |  |  |
Senior notes | 4.875% senior notes due 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, principal | 338,000,000 | $ 272,000,000 | $ 272,000,000 | 338,000,000 |  |  |
Interest rate, stated percentage |  | 4.875% | 4.875% |  |  |  |
Debt repurchased amount |  | $ 66,000,000 | $ 66,000,000 |  |  |  |
Senior notes | 5.75% senior notes due 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, principal | 209,000,000 | $ 167,000,000 | $ 167,000,000 | 209,000,000 |  |  |
Interest rate, stated percentage |  | 5.75% | 5.75% |  |  |  |
Debt repurchased amount |  | $ 42,000,000 | $ 42,000,000 |  |  |  |
Convertible debt | 2.25% contingent convertible senior notes due 2038 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, principal | $ 1,000,000 |  |  | 1,000,000 |  |  |
Interest rate, stated percentage |  | 2.25% | 2.25% |  |  |  |
Debt repurchased amount |  |  |  |  |  |  | $ 8,000,000
Convertible debt | Chesapeake senior notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit facility |  | $ 186,000,000 | $ 186,000,000 |  |  |  |
Conversation of common stock shares outstanding (in shares) |  | 73,389,094 |  |  |  |  |
Term loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt term | 4 years 6 months |  |  |  |  |  |
Debt, principal | $ 1,500,000,000 | $ 1,500,000,000 | $ 1,500,000,000 | 1,500,000,000 |  |  |
Proceeds from debt, net | 1,455,000,000 |  |  |  |  |  |
Debt repurchased amount | 1,233,000,000 |  |  | 1,233,000,000 |  |  |
Cash paid to purchase debt |  |  |  | 1,285,000,000 |  |  |
Premium | 52,000,000 |  |  | 52,000,000 |  |  |
Gains (losses) on repurchases of debt |  |  |  | (65,000,000) |  |  |
Deferred charges | $ 13,000,000 |  |  | $ 13,000,000 |  |  |
Term loan | London interbank offered rate (LIBOR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 8.00% |  |  |  |  |  |
Term loan | LIBOR Floor |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |
Term loan | Alternative base rate (ABR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 7.00% |  |  |  |  |  |
Debt, percent of par | 98.00% |  |  |  |  |  |
Debt, premium of par |  | 5.00% | 5.00% |  |  |  |
Debt, premium of par |  | 2.50% | 2.50% |  |  |  |
Debt instrument, covenant, principal balance |  | $ 125,000,000 | $ 125,000,000 |  |  |  |
Term loan | Alternative Base Rate (ABR) Floor |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% |  |  |  |  |  |

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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 The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or 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 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 2: 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 + 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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