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- Definition

Debt Instrument, Leverage Ratio Test

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- Definition

Debtor Reorganization Items, Adjustment of Pre-petition Accounts Payable Settlements

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Debtor Reorganization Items, Adjustment of Pre-petition Revenue Settlements

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Debtor Reorganization Items, Debtor-in-Possession, Exit Credit Facilities Maximum Borrowing Capacity

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- Definition

Debtor Reorganization Items, Write-off of Debt Issuance Costs

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- Definition

Debtor Reorganization Items, Write-off of Debt Premiums (Discounts)

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- Definition

Debtor-in-Possession Financing, Fee on Borrowing Arrangements

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Hedging Agreements, Duration Period

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Hedging Agreements, Period to Enter

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- Definition

Holders of Obligation, Pro Rata Share as Percent of New Common Stock

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Holders of Obligation, Pro Rata Share as Percent of New Warrants

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Liabilities Subject to Compromise, Accrued Interest

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Liabilities Subject to Compromise, Debt

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Line of Credit Facility, Covenant, Liquidity

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Loss Contingency, Number of Proofs of Claim

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Percent Of Forecasted Production for Period

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Percent of Anticipated Projected Monthly Production from Proved Developed Production

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- Definition

Percent of New Common Stock Purchased with Warrants

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- Definition

Percent of Projected Monthly Production under Hedge

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- Definition

Percent of Warrants to Purchase Percent of New Common Stock

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- Definition

Warrants to Purchase Additional Percent of New Common Stock

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- Definition

Warrants to Purchase Percent of New Common Stock

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- Definition

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 of reorganization items related to debtor-in-possession facility financing costs.

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Amount of reorganization items related to legal and advisory professional fees related to entities in bankruptcy.

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Amount of expense for claims expected to be incurred by an entity in reorganization.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Total amount of liabilities subject to compromise.

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The amount of trade accounts payable included in liabilities subject to compromise.

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The amount of other obligations included in liabilities subject to compromise.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Chapter 11 Proceedings (Details)			3 Months Ended		9 Months Ended
Chapter 11 Proceedings (Details)	Nov. 05, 2020 USD ($) proof_of_claim	Jun. 28, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Period to enter		30 days
Percent of projected monthly production under hedge		50.00%
Duration period		24 months
Warrants to purchase percent of new common stock		10.00%
Warrants to purchase additional percent of new common stock		10.00%
Percent of warrants to purchase percent of new common stock		50.00%
Percent of new common stock purchased with warrants		10.00%
Fee on borrowing arrangements			$ 118,000,000
Liabilities Subject to Compromise
Debt			7,166,000,000		$ 7,166,000,000
Accounts payable			148,000,000		148,000,000
Accrued interest			235,000,000		235,000,000
Other liabilities			879,000,000		879,000,000
Liabilities subject to compromise			8,428,000,000		8,428,000,000		$ 0
Reorganization Items
Write off of unamortized debt premiums (discounts)			0	$ 0	518,000,000	$ 0
Write off of unamortized debt issuance costs			0	0	(61,000,000)	0
Debt and equity financing fees			(115,000,000)	0	(178,000,000)	0
Provision for allowed claims			(465,000,000)	0	(465,000,000)	0
Legal and professional fees			(40,000,000)	0	(40,000,000)	0
Gain on settlement of pre-petition accounts payable			12,000,000	0	12,000,000	0
Loss on settlement of pre-petition revenues payable			(3,000,000)	0	(3,000,000)	0
Reorganization items, net			$ (611,000,000)	$ 0	$ (217,000,000)	$ 0
During 24 Months
Debt Instrument [Line Items]
Percent of forecasted production for period		80.00%
Percent of anticipated projected monthly production from proved developed production		80.00%
For 6 Months Following Period
Debt Instrument [Line Items]
Percent of projected monthly production under hedge		90.00%
After 24 Months
Debt Instrument [Line Items]
Percent of projected monthly production under hedge		80.00%
Subsequent Event \| Pending litigation \| Healthcare of Ontario Pension Plan (HOOPP)
Debt Instrument [Line Items]
Number of proofs of claim \| proof_of_claim	7,350
Loss contingency, damages sought, value	$ 11,200,000,000
Debtor-in-Possession Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 2,104,000,000
Exit credit facilities borrowing capacity		$ 2,500,000,000
Debtor-in-Possession Credit Agreement \| Minimum
Debt Instrument [Line Items]
Asset coverage ratio		1.25
Debtor-in-Possession Credit Agreement \| Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 925,000,000
Letters of credit outstanding, amount		200,000,000
Exit credit facilities borrowing capacity		1,750,000,000
Exit Credit Facilities \| Minimum
Debt Instrument [Line Items]
Liquidity		$ 500,000,000
Leverage ratio		2.25
Asset coverage ratio		1.50
Senior notes \| 11.5% senior secured second lien notes due 2025
Debt Instrument [Line Items]
Interest rate, stated percentage			11.50%		11.50%
Holders of obligation, pro rata share as percent of new common stock		12.00%
Term Loan \| FLLO Term Loan Facility
Debt Instrument [Line Items]
Holders of obligation, pro rata share as percent of new common stock		76.00%
Term Loan \| Debtor-in-Possession Credit Agreement
Debt Instrument [Line Items]
Debt		$ 1,179,000,000
Unsecured Debt
Debt Instrument [Line Items]
Holders of obligation, pro rata share as percent of new common stock		12.00%
Holders of obligation, pro rata share as percent of new warrants		50.00%
Secured Debt \| Debtor-in-Possession Credit Agreement
Debt Instrument [Line Items]
Exit credit facilities borrowing capacity		$ 750,000,000