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Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2023
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations
Activity related to the Company’s asset retirement obligations is as follows:
(In millions)Nine Months Ended 
September 30, 2023
Balance at beginning of period$277 
Liabilities incurred4 
Liabilities divested(4)
Accretion expense8 
Balance at end of period285 
Less: current asset retirement obligations(7)
Noncurrent asset retirement obligations$278