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ASSET RETIREMENT OBLIGATION (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Changes to Asset Retirement Obligation
The following table describes changes to the Company’s asset retirement obligation (ARO) liability for the years ended December 31, 2019 and 2018:
 
 
 
2019
 
2018
 
 
(In millions)
Asset retirement obligation at beginning of year
 
$
1,932

 
$
1,835

Liabilities incurred
 
41

 
51

Liabilities divested
 
(56
)
 
—

Liabilities settled
 
(56
)
 
(52
)
Accretion expense
 
107

 
108

Revisions in estimated liabilities
 
(110
)
 
(10
)
Asset retirement obligation at end of year
 
1,858

 
1,932

Less current portion
 
(47
)
 
(66
)
Asset retirement obligation, long-term
 
$
1,811

 
$
1,866