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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations
Activity related to the Company's asset retirement obligations is as follows:
Year Ended December 31,
(In millions)20212020
Balance at beginning of period$86 $72 
Liabilities assumed in Merger175 — 
Liabilities incurred6 10 
Liabilities settled (10)— 
Accretion expense6 4 
Balance at end of period263 86 
Less: current asset retirement obligation(4)(1)
Noncurrent asset retirement obligation$259 $85