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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2021
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligations ASSET RETIREMENT OBLIGATIONS
The following table summarizes the Company’s 2021 and 2020 activity related to asset retirement obligations:
(in millions)20212020
Asset retirement obligation at January 1$85 $57 
Accretion of discount6 4 
Obligations incurred1 1 
Obligations assumed through mergers36 28 
Obligations settled/removed(20)(6)
Revisions of estimates1 1 
Asset retirement obligation at December 31$109 $85 
Current liability$4 $4 
Long-term liability105 81 
Asset retirement obligation at December 31$109 $85