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ASSET RETIREMENT OBLIGATION
 3 Months Ended
Mar. 31, 2018
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 for the three-month period ended March 31, 2018:
 
 
(In millions)
Asset retirement obligation at December 31, 2017
 
$
1,835

Liabilities incurred
 
7

Liabilities settled
 
(8
)
Accretion expense
 
27

Asset retirement obligation at March 31, 2018
 
1,861

Less current portion
 
(42
)
Asset retirement obligation, long-term
 
$
1,819