Debt - Long-Term Debt Table (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
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)
Debt, current	(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, fair value	0	8,531,000,000
Long-term debt, net	0	9,073,000,000
Line of credit \| Revolving credit facility \| Pre-petition revolving credit facility
Debt Instrument [Line Items]
Principal amount	1,929,000,000	1,590,000,000
Chesapeake revolving credit facility	1,929,000,000	1,590,000,000
Term loan
Debt Instrument [Line Items]
Principal amount	1,500,000,000	1,500,000,000
Carrying amount	$ 1,500,000,000	1,470,000,000
Senior notes \| 11.5% senior secured second lien notes due 2025
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
Interest rate, stated percentage	7.00%
Principal amount	$ 624,000,000	624,000,000
Carrying amount	$ 624,000,000	624,000,000
Senior notes \| 6.875% senior notes due 2025
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
Principal amount	119,000,000	119,000,000
Carrying amount	119,000,000	119,000,000
Senior notes \| 8.00% senior notes due 2026
Debt Instrument [Line Items]
Principal amount	46,000,000	46,000,000
Carrying amount	$ 46,000,000	44,000,000
Senior notes \| 8.00% senior notes due 2027
Debt Instrument [Line Items]
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
Debt Instrument [Line Items]
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
Convertible debt \| 7.5% senior notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	7.50%
Convertible debt \| 8.00% senior notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	8.00%

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.

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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.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The total amount of long-term liability charges that are being deferred beyond one year.

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The amount of debt and related accrued interest included in liabilities subject to compromise.

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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.

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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.

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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.

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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.

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