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ASSET RETIREMENT OBLIGATION
 6 Months Ended
Jun. 30, 2021
Asset Retirement Obligation Disclosure [Abstract]  
ASSET RETIREMENT OBLIGATION ASSET RETIREMENT OBLIGATION
The following table describes changes to the Company’s asset retirement obligation (ARO) liability:
June 30,
2021
 (In millions)
Asset retirement obligation, December 31, 2020
$1,944 
Liabilities incurred3 
Liabilities settled(10)
Liabilities divested(44)
Accretion expense56 
Asset retirement obligation, June 30, 2021
1,949 
Less current portion(56)
Asset retirement obligation, long-term$1,893