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Debt - Long-Term Debt (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Long-term Debt [Abstract] |  |  |
Principal Amount | $ 9,095,000,000 | $ 8,916,000,000 |
Carrying Amount | 9,095,000,000 | 9,458,000,000 |
Debt issuance costs | 0 | (44,000,000) |
Current maturities of long-term debt, gross | (1,929,000,000) | (385,000,000) |
Current maturities of long-term debt, net | (1,929,000,000) | (385,000,000) |
Less amounts reclassified to liabilities subject to compromise | (7,166,000,000) | 0 |
Long-term debt, net | 0 | 8,531,000,000 |
Long-term debt, net | 0 | 9,073,000,000 |
Credit facility | Chesapeake revolving credit facility |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | 1,929,000,000 | 1,590,000,000 |
Revolving credit facility | 1,929,000,000 | 1,590,000,000 |
Credit facility | Debtor-in-Possession Credit Agreement |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | 0 | 0 |
Revolving credit facility | 0 | 0 |
Term loan |  |  |
Long-term Debt [Abstract] |  |  |
Principal Amount | 1,500,000,000 | 1,500,000,000 |
Carrying Amount | $ 1,500,000,000 | 1,470,000,000 |
Debt issuance costs |  | (13,000,000) |
Senior notes | 11.5% senior secured second lien notes due 2025 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 11.50% |  |
Principal Amount | $ 2,330,000,000 | 2,330,000,000 |
Carrying Amount | $ 2,330,000,000 | 3,248,000,000 |
Senior notes | 6.625% senior notes due 2020 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 6.625% |  |
Principal Amount | $ 176,000,000 | 208,000,000 |
Carrying Amount | $ 176,000,000 | 208,000,000 |
Senior notes | 6.875% senior notes due 2020 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 6.875% |  |
Principal Amount | $ 73,000,000 | 93,000,000 |
Carrying Amount | $ 73,000,000 | 93,000,000 |
Senior notes | 6.125% senior notes due 2021 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 6.125% |  |
Principal Amount | $ 167,000,000 | 167,000,000 |
Carrying Amount | $ 167,000,000 | 167,000,000 |
Senior notes | 5.375% senior notes due 2021 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 5.375% |  |
Principal Amount | $ 127,000,000 | 127,000,000 |
Carrying Amount | $ 127,000,000 | 127,000,000 |
Senior notes | 4.875% senior notes due 2022 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 4.875% |  |
Principal Amount | $ 272,000,000 | 338,000,000 |
Carrying Amount | $ 272,000,000 | 338,000,000 |
Senior notes | 5.75% senior notes due 2023 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 5.75% |  |
Principal Amount | $ 167,000,000 | 209,000,000 |
Carrying Amount | $ 167,000,000 | 209,000,000 |
Senior notes | 7.00% senior notes due 2024 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 7.00% |  | 7.00%
Principal Amount | $ 624,000,000 | 624,000,000 | $ 850,000,000
Carrying Amount | $ 624,000,000 | 624,000,000 |
Senior notes | 6.875% senior notes due 2025 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 6.875% |  |
Principal Amount | $ 2,000,000 | 2,000,000 |
Carrying Amount | $ 2,000,000 | 2,000,000 |
Senior notes | 8.00% senior notes due 2025 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 8.00% |  |
Principal Amount | $ 246,000,000 | 246,000,000 |
Carrying Amount | $ 246,000,000 | 245,000,000 |
Senior notes | 7.5% senior notes due 2026 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 7.50% |  | 7.50%
Principal Amount | $ 119,000,000 | 119,000,000 | $ 400,000,000
Carrying Amount | $ 119,000,000 | 119,000,000 |
Senior notes | 8.00% senior notes due 2026 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 8.00% |  |
Principal Amount | $ 46,000,000 | 46,000,000 |
Revolving credit facility | 919,000,000 |  |
Carrying Amount | $ 46,000,000 | 44,000,000 |
Senior notes | 8.00% senior notes due 2027 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 8.00% |  |
Principal Amount | $ 253,000,000 | 253,000,000 |
Carrying Amount | $ 253,000,000 | 253,000,000 |
Convertible debt | 5.5% convertible senior notes due 2026 |  |  |
Long-term Debt [Abstract] |  |  |
Interest rate, stated percentage | 5.50% |  |
Principal Amount | $ 1,064,000,000 | 1,064,000,000 |
Carrying Amount | $ 1,064,000,000 | $ 765,000,000 |

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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + 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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- Definition The total amount of long-term liability charges that are being deferred beyond one year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition The amount of debt and related accrued interest included in liabilities subject to compromise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56145-112766 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120604989&loc=d3e56015-112765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116635682&loc=d3e55717-112764 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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