Debt - Long-Term Debt Table (Details) - USD ($)	Mar. 31, 2019	Feb. 01, 2019	Dec. 31, 2018
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 9,978,000,000		$ 8,168,000,000
Long-term Debt, Gross	9,547,000,000		7,722,000,000
Debt issuance costs	(50,000,000)		(53,000,000)
Debt, current	(380,000,000)		(381,000,000)
Current maturities of long-term debt, net	(380,000,000)		(381,000,000)
Long-term debt, fair value	9,598,000,000		7,787,000,000
Long-term debt, net	9,167,000,000		7,341,000,000
Interest rate derivatives
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	0		0
Interest rate derivatives	1,000,000		1,000,000
Senior notes \| Floating rate senior notes due 2019
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	380,000,000		380,000,000
Long-term Debt, Gross	380,000,000		380,000,000
Senior notes \| 6.625% senior notes due 2020
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	437,000,000		437,000,000
Long-term Debt, Gross	$ 437,000,000		437,000,000
Interest rate, stated percentage	6.625%
Senior notes \| 6.875% senior notes due 2020
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 227,000,000		227,000,000
Long-term Debt, Gross	$ 227,000,000		227,000,000
Interest rate, stated percentage	6.875%
Senior notes \| 6.125% senior notes due 2021
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 548,000,000		548,000,000
Long-term Debt, Gross	$ 548,000,000		548,000,000
Interest rate, stated percentage	6.125%
Senior notes \| 5.375% senior notes due 2021
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 267,000,000		267,000,000
Long-term Debt, Gross	$ 267,000,000		267,000,000
Interest rate, stated percentage	5.375%
Senior notes \| 4.875% senior notes due 2022
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 451,000,000		451,000,000
Long-term Debt, Gross	$ 451,000,000		451,000,000
Interest rate, stated percentage	4.875%
Senior notes \| 5.75% senior notes due 2023
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 338,000,000		338,000,000
Long-term Debt, Gross	$ 338,000,000		338,000,000
Interest rate, stated percentage	5.75%
Senior notes \| 7.00% senior notes due 2024
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 850,000,000		850,000,000
Long-term Debt, Gross	$ 850,000,000		850,000,000
Interest rate, stated percentage	7.00%
Senior notes \| 6.875% senior notes due 2025(a)
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 700,000,000	$ 700,000,000	0
Long-term Debt, Gross	$ 704,000,000		0
Interest rate, stated percentage	6.875%	6.875%
Senior notes \| 8.00% senior notes due 2025
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,300,000,000		1,300,000,000
Long-term Debt, Gross	$ 1,291,000,000		1,291,000,000
Interest rate, stated percentage	8.00%
Senior notes \| 7.5% senior notes due 2026
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 400,000,000		400,000,000
Long-term Debt, Gross	400,000,000		400,000,000
Senior notes \| 8.00% senior notes due 2027
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	1,300,000,000		1,300,000,000
Long-term Debt, Gross	$ 1,299,000,000		1,299,000,000
Interest rate, stated percentage	8.00%
Convertible debt \| 5.5% convertible senior notes due 2026(b)(c)
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,250,000,000		1,250,000,000
Long-term Debt, Gross	$ 874,000,000		866,000,000
Interest rate, stated percentage	5.50%
Interest rate, effective percentage	11.50%
Convertible debt \| 7.5% senior notes due 2026
Long-Term Debt Instrument [Line Items]
Interest rate, stated percentage	7.50%
Convertible debt \| 2.25% contingent convertible senior notes due 2038
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 0		1,000,000
Long-term Debt, Gross	$ 0		1,000,000
Interest rate, stated percentage	2.25%
Line of credit \| Chesapeake revolving credit facility \| Revolving credit facility
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	$ 842,000,000		419,000,000
Chesapeake revolving credit facility	842,000,000		419,000,000
Line of credit \| BVL revolving credit facility(a) \| Revolving credit facility
Long-Term Debt Instrument [Line Items]
Debt instrument, face amount	688,000,000		0
Chesapeake revolving credit facility	$ 688,000,000		$ 0

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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- 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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- Definition

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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- 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.

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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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