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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2022
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
22.Asset Retirement Obligations
The components of the change in our asset retirement obligations are shown below:
SuccessorPredecessor
Year Ended December 31, 2022Period from February 10, 2021 through December 31, 2021Period from January 1, 2021 through February 9, 2021
Asset retirement obligations, beginning of period$360 $241 $144 
Additions(a)
53 48 — 
Revisions(b)
16 63 — 
Settlements and disposals(c)
(54)(3)(1)
Held for sale(d)
(57)— — 
Accretion expense17 11 1 
Impact of fresh start accounting— — 97 
Asset retirement obligations, end of period335 360 241 
Less current portion12 11 5 
Asset retirement obligations, long-term$323 $349 $236 
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(a)    During the 2022 Successor Period, approximately $27 million of additions relate to the Marcellus Acquisition. During the 2021 Successor Period, approximately $44 million of additions relate to the Vine Acquisition. See Note 4 for further discussion of these transactions.
(b)    Revisions primarily represent changes in the present value of liabilities resulting from changes in estimated costs and economic lives of producing properties.
(c)    During the 2022 Successor Period, approximately $47 million of disposals related to our Powder River Basin assets. See Note 4 for further discussion of these transactions.
(d)    As of December 31, 2022, approximately $57 million of asset retirement obligations associated with the sale of a portion of our Eagle Ford assets have been reclassified as other current liabilities held for sale.