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Chapter 11 Proceedings (Details) |  | 6 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 09, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Feb. 25, 2021 USD ($) proof_of_claim | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 28, 2020 USD ($) shares
Liabilities Subject to Compromise |  |  |  |  |  |  |
Debt |  | $ 7,166,000,000 |  | $ 7,166,000,000 |  |  |
Accounts payable |  | 15,000,000 |  | 15,000,000 |  |  |
Accrued interest |  | 235,000,000 |  | 235,000,000 |  |  |
Provision for contract rejection damages |  | 729,000,000 |  | 729,000,000 |  |  |
Other liabilities |  | 498,000,000 |  | 498,000,000 |  |  |
Liabilities subject to compromise |  | 8,643,000,000 |  | 8,643,000,000 | $ 0 |  |
Reorganization Items |  |  |  |  |  |  |
Provision for allowed claims |  |  |  | 879,000,000 |  |  |
Write off of unamortized debt premiums (discounts) |  |  |  | 518,000,000 |  |  |
Write off of unamortized debt issuance costs |  |  |  | (61,000,000) |  |  |
Debt and equity financing fees |  |  |  | (145,000,000) |  |  |
Loss on divested assets |  |  |  | (128,000,000) |  |  |
Provision for allowed claims |  |  |  | (879,000,000) |  |  |
Legal and professional fees |  |  |  | (113,000,000) |  |  |
Gain on settlement of pre-petition accounts payable |  |  |  | 15,000,000 |  |  |
Loss on settlement of pre-petition revenues payable |  |  |  | (3,000,000) |  |  |
Reorganization items, net |  |  |  | (796,000,000) | $ 0 | $ 0 |
Chesapeake revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit, maximum borrowing capacity |  | 4,000,000,000.0 |  | 4,000,000,000.0 |  |  |
Revolving credit, outstanding |  | $ 54,000,000 |  | $ 54,000,000 |  |  |
2021 Long Term Incentive Plan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Common stock, reserved for future issuance (in shares) | shares |  |  |  |  |  |  | 6,800,000
Class A Warrants |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Warrants issued (in shares) | shares |  | 11,100,000 |  |  |  |  |
Class B Warrants |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Warrants issued (in shares) | shares |  | 12,300,000 |  |  |  |  |
Class C Warrants |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Warrants issued (in shares) | shares |  | 13,700,000 |  |  |  |  |
Debtor-in-Possession Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit, maximum borrowing capacity |  |  |  |  |  |  | $ 2,104,000,000
Exit credit facilities borrowing capacity |  |  |  |  |  |  | 2,500,000,000
Debtor-in-Possession Credit Agreement | Chesapeake revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit, maximum borrowing capacity |  |  |  |  |  |  | 925,000,000
Revolving credit, outstanding |  |  |  |  |  |  | 200,000,000
Exit credit facilities borrowing capacity |  |  |  |  |  |  | 1,750,000,000
Debtor-in-Possession Credit Agreement | Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | 1,179,000,000
Debtor-in-Possession Credit Agreement | Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Exit credit facilities borrowing capacity |  |  |  |  |  |  | $ 750,000,000
New Common Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock issued during period, new issues (in shares) | shares |  | 97,900,000 |  |  |  |  |
Common stock, reserved for future issuance (in shares) | shares |  | 2,100,000 |  | 2,100,000 |  |  |
Subsequent event | Pending litigation | Healthcare of Ontario Pension Plan (HOOPP) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of proofs of claim | proof_of_claim |  |  | 8,100 |  |  |  |
Percent from unsecured claims |  |  | 72.00% |  |  |  |
Damages sought, value |  |  | $ 42,700,000,000 |  |  |  |
Subsequent event | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Fresh-start adjustment, increase (decrease), assets | $ 3,500,000,000 |  |  |  |  |  |
Fresh-start adjustment, increase (decrease), liabilities and stockholders' equity | $ 3,500,000,000 |  |  |  |  |  |
Subsequent event | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percent of voting hares received by holders | 50.00% |  |  |  |  |  |
Fresh-start adjustment, increase (decrease), assets | $ 4,700,000,000 |  |  |  |  |  |
Fresh-start adjustment, increase (decrease), liabilities and stockholders' equity | $ 4,700,000,000 |  |  |  |  |  |
Subsequent event | New Common Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock issued during period, new issues (in shares) | shares | 97,907,081 |  |  |  |  |  |
Common stock, reserved for future issuance (in shares) | shares | 2,092,918 |  |  |  |  |  |
Subsequent event | New Common Stock | Backstop Parties, Put Option Premium |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock issued during period, new issues (in shares) | shares | 6,337,031 |  |  |  |  |  |
Subsequent event | New Common Stock | Backstop Parties, Obligations |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock issued during period, new issues (in shares) | shares | 442,991 |  |  |  |  |  |
Subsequent event | New Common Stock | 2021 Long Term Incentive Plan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock issued during period, new issues (in shares) | shares | 62,927,320 |  |  |  |  |  |
Subsequent event | New Common Stock | Class C Warrants |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Common stock, reserved for future issuance (in shares) | shares | 3,948,893 |  |  |  |  |  |
Subsequent event | New Common Stock | FLLO Term Loan Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Pro rata share received by holder (in shares) | shares | 23,022,420 |  |  |  |  |  |
Subsequent event | New Common Stock | Second Lien Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Pro rata share received by holder (in shares) | shares | 3,635,118 |  |  |  |  |  |
Subsequent event | New Common Stock | Second Lien Notes | Class A Warrants |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock issued during period, new issues (in shares) | shares | 11,111,111 |  |  |  |  |  |
Warrants issued (in shares) | shares | 11,111,111 |  |  |  |  |  |
Subsequent event | New Common Stock | Second Lien Notes | Class B Warrants |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock issued during period, new issues (in shares) | shares | 12,345,679 |  |  |  |  |  |
Warrants issued (in shares) | shares | 12,345,679 |  |  |  |  |  |
Subsequent event | New Common Stock | Second Lien Notes | Class C Warrants |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock issued during period, new issues (in shares) | shares | 6,858,710 |  |  |  |  |  |
Warrants issued (in shares) | shares | 6,858,710 |  |  |  |  |  |
Subsequent event | New Common Stock | Allowed Unsecured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Pro rata share received by holder (in shares) | shares | 1,311,089 |  |  |  |  |  |
Subsequent event | New Common Stock | Allowed Unsecured Notes | Class C Warrants |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock issued during period, new issues (in shares) | shares | 2,473,757 |  |  |  |  |  |
Warrants issued (in shares) | shares | 2,473,757 |  |  |  |  |  |
Subsequent event | New Common Stock | Allowed General Unsecured Claim |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Pro rata share received by holder (in shares) | shares | 231,112 |  |  |  |  |  |
Pro rata share received by holder | $ 10,000,000 |  |  |  |  |  |
Subsequent event | New Common Stock | Allowed General Unsecured Claim | Class C Warrants |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stock issued during period, new issues (in shares) | shares | 436,060 |  |  |  |  |  |
Warrants issued (in shares) | shares | 436,060 |  |  |  |  |  |
Subsequent event | New Common Stock | Upon Exercise of Warrants |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Common stock, reserved for future issuance (in shares) | shares | 37,174,210 |  |  |  |  |  |

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