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ASSET RETIREMENT OBLIGATION (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017:
 
 
 
2018
 
2017
 
 
(In millions)
Asset retirement obligation at beginning of year
 
$
1,835

 
$
2,498

Liabilities incurred
 
51

 
58

Liabilities divested
 
—

 
(818
)
Liabilities settled
 
(52
)
 
(45
)
Accretion expense
 
108

 
130

Revisions in estimated liabilities
 
(10
)
 
12

Asset retirement obligation at end of year
 
1,932

 
1,835

Less current portion
 
(66
)
 
(43
)
Asset retirement obligation, long-term
 
$
1,866

 
$
1,792