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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2024
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
16.Asset Retirement Obligations
The components of the change in our asset retirement obligations are shown below:
Years Ended December 31,
20242023
Asset retirement obligations, beginning of period$276 $335 
Additions(a)
263 9 
Revisions(b)
(21)(9)
Settlements and disposals(c)
(5)(75)
Accretion expense18 16 
Asset retirement obligations, end of period531 276 
Less current portion32 11 
Asset retirement obligations, long-term$499 $265 
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(a)    During the year ended December 31, 2024, approximately $251 million of additions relate to the Southwestern Merger. See Note 2 for further discussion of this transaction.
(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 year ended December 31, 2023, approximately $64 million of disposals related to the divestitures of our Eagle Ford assets. See Note 2 for further discussion of these transactions.