Asset Retirement Obligations (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
Feb. 09, 2021	Dec. 31, 2021	Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligations, beginning of period	$ 144	$ 241	$ 360
Additions	0	48	53
Revisions	0	63	16
Settlements and disposals	(1)	(3)	(54)
Held for sale	0	0	(57)
Accretion expense	1	11	17
Impact of fresh start accounting	97	0	0
Asset retirement obligations, end of period	241	360	335
Asset Retirement Obligation	241	360	335
Less current portion	5	11	12
Asset retirement obligations, long-term	236	349	323
Business Acquisition [Line Items]
Additions	0	48	53
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposals	1	3	54
Held for sale	$ 0	0	57
Powder River Basin
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Settlements and disposals			(47)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposals			47
Eagle Ford
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Held for sale			(57)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Held for sale			57
Marcellus
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Additions			27
Business Acquisition [Line Items]
Additions			$ 27
Vine Energy Corporation (Vine)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Additions		44
Business Acquisition [Line Items]
Additions		$ 44

Asset Retirement Obligation, Held For Sale

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Asset Retirement Obligation, Impact Of Fresh Start Accounting

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 25
-Paragraph 4
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-Publisher FASB
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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

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-Publisher FASB
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Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
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Amount of asset retirement obligations incurred during the period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-SubTopic 20
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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
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-Paragraph 1
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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(4)
-URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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