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Asset Retirement Obligations
 6 Months Ended
Jun. 30, 2024
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)Six Months Ended 
June 30, 2024
Balance at beginning of period$289 
Liabilities incurred4 
Liabilities settled (1)
Accretion expense6 
Balance at end of period298 
Less: current asset retirement obligations(12)
Noncurrent asset retirement obligations$286