Debt - Long-Term Debt (Details)	12 Months Ended
Dec. 31, 2019 USD ($) day $ / shares	Dec. 31, 2018 USD ($)	Feb. 01, 2019
Long-term Debt [Abstract]
Principal Amount	$ 8,916,000,000	$ 8,168,000,000
Carrying Amount	9,458,000,000	7,722,000,000
Debt issuance costs	(44,000,000)	(53,000,000)
Current maturities of long-term debt, gross	(385,000,000)	(381,000,000)
Current maturities of long-term debt, net	(385,000,000)	(381,000,000)
Long-term debt, net	8,531,000,000	7,787,000,000
Long-term debt, net	$ 9,073,000,000	7,341,000,000
Consecutive trading days \| day	5
Interest Rate Contract
Long-term Debt [Abstract]
Principal Amount	$ 0	0
Interest rate derivatives	0	1,000,000
6.625% Senior Notes Due 2020, 4.875% Senior Notes Due 2022, and 5.75% Senior Notes Due 2023
Long-term Debt [Abstract]
Principal Amount	101,000,000
Revolving credit facility \| Chesapeake revolving credit facility
Long-term Debt [Abstract]
Principal Amount	1,590,000,000	419,000,000
Revolving credit facility	1,590,000,000	419,000,000
Term loan
Long-term Debt [Abstract]
Principal Amount	1,500,000,000	0
Carrying Amount	$ 1,470,000,000	0
Debt issuance costs		$ (13,000,000)
Senior notes
Long-term Debt [Abstract]
Redemption price percentage	35.00%	35.00%
Percentage of principal amount redeemed	100.00%	100.00%
Senior notes \| 11.5% senior secured second lien notes due 2025
Long-term Debt [Abstract]
Principal Amount	$ 2,330,000,000	$ 0
Carrying Amount	$ 3,248,000,000	0
Interest rate, stated percentage	11.50%
Senior notes \| Floating rate senior notes due 2019
Long-term Debt [Abstract]
Principal Amount	$ 0	380,000,000
Carrying Amount	0	380,000,000
Senior notes \| 6.625% senior notes due 2020
Long-term Debt [Abstract]
Principal Amount	208,000,000	437,000,000
Carrying Amount	$ 208,000,000	437,000,000
Interest rate, stated percentage	6.625%
Senior notes \| 6.875% senior notes due 2020
Long-term Debt [Abstract]
Principal Amount	$ 93,000,000	227,000,000
Carrying Amount	$ 93,000,000	227,000,000
Interest rate, stated percentage	6.875%
Senior notes \| 6.125% senior notes due 2021
Long-term Debt [Abstract]
Principal Amount	$ 167,000,000	548,000,000
Carrying Amount	$ 167,000,000	548,000,000
Interest rate, stated percentage	6.125%
Senior notes \| 5.375% senior notes due 2021
Long-term Debt [Abstract]
Principal Amount	$ 127,000,000	267,000,000
Carrying Amount	$ 127,000,000	267,000,000
Interest rate, stated percentage	5.375%
Senior notes \| 4.875% Senior Notes due 2022
Long-term Debt [Abstract]
Principal Amount	$ 338,000,000	451,000,000
Carrying Amount	$ 338,000,000	451,000,000
Interest rate, stated percentage	4.875%
Senior notes \| 5.75% Senior Notes due 2023
Long-term Debt [Abstract]
Principal Amount	$ 209,000,000	338,000,000
Carrying Amount	$ 209,000,000	338,000,000
Interest rate, stated percentage	5.75%
Senior notes \| 7.00% senior notes due 2024
Long-term Debt [Abstract]
Principal Amount	$ 624,000,000	850,000,000
Carrying Amount	$ 624,000,000	$ 850,000,000
Interest rate, stated percentage	7.00%	7.00%
Senior notes \| 6.875% senior notes due 2025
Long-term Debt [Abstract]
Principal Amount	$ 2,000,000	$ 0
Carrying Amount	$ 2,000,000	0
Interest rate, stated percentage	6.875%		6.875%
Senior notes \| 8.00% senior notes due 2025
Long-term Debt [Abstract]
Principal Amount	$ 246,000,000	1,300,000,000
Carrying Amount	$ 245,000,000	1,291,000,000
Interest rate, stated percentage	8.00%
Senior notes \| 7.5% senior notes due 2026
Long-term Debt [Abstract]
Principal Amount	$ 119,000,000	400,000,000
Carrying Amount	$ 119,000,000	$ 400,000,000
Interest rate, stated percentage	7.50%	7.50%
Senior notes \| 8.00% senior notes due 2026
Long-term Debt [Abstract]
Principal Amount	$ 46,000,000	$ 0
Carrying Amount	44,000,000	0
Revolving credit facility	$ 919,000,000
Interest rate, stated percentage	8.00%
Senior notes \| 8.00% senior notes due 2027
Long-term Debt [Abstract]
Principal Amount	$ 253,000,000	1,300,000,000
Carrying Amount	$ 253,000,000	1,299,000,000
Interest rate, stated percentage	8.00%
Convertible debt \| 5.5% convertible senior notes due 2026
Long-term Debt [Abstract]
Principal Amount	$ 1,064,000,000	1,250,000,000
Carrying Amount	$ 765,000,000	866,000,000
Interest rate, stated percentage	5.50%
Interest rate, effective percentage	11.50%
Convertible debt \| 5.5% convertible senior notes due 2026 \| Optional Conversion by Holders
Long-term Debt [Abstract]
Threshold percentage of stock price trigger	130.00%
Conversion price (in usd per share) \| $ / shares	$ 8.568
Percentage of principal amount redeemed	100.00%
Convertible debt \| 5.5% convertible senior notes due 2026 \| Optional Redemption by the Company
Long-term Debt [Abstract]
Threshold percentage of stock price trigger	130.00%
Redemption price percentage	100.00%
Convertible debt \| 2.25% contingent convertible senior notes due 2038
Long-term Debt [Abstract]
Principal Amount	$ 0	1,000,000
Carrying Amount	$ 0	1,000,000
Interest rate, stated percentage	2.25%
Interest rate, effective percentage	8.00%
Convertible debt \| All convertible and all contingent convertible debt
Long-term Debt [Abstract]
Unamortized discount	$ 299,000,000	$ 384,000,000

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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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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No definition available.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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No definition available.

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

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-Publisher FASB
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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Percentage of principal amount of debt redeemed.

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No definition available.

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Amount, after accumulated amortization, of debt discount.

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Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective fair value hedge that is amortized upon discontinuation of the fair value hedge.

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

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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.

+ References

No definition available.

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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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