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ASSET RETIREMENT OBLIGATION (Tables)
 9 Months Ended
Sep. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
The following table describes changes to the Company’s asset retirement obligation (ARO) liability for the nine-month period ended September 30, 2018:
 
 
(In millions)
Asset retirement obligation at December 31, 2017
 
$
1,835

Liabilities incurred
 
27

Liabilities settled
 
(39
)
Accretion expense
 
81

Revisions in estimated liabilities
 
1

Asset retirement obligation at September 30, 2018
 
1,905

Less current portion
 
(38
)
Asset retirement obligation, long-term
 
$
1,867