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ASSET RETIREMENT OBLIGATION
 3 Months Ended
Mar. 31, 2019
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, 2019:
 
 
(In millions)
Asset retirement obligation at December 31, 2018
 
$
1,932

Liabilities incurred
 
3

Liabilities settled
 
(11
)
Liabilities held for sale
 
(6
)
Accretion expense
 
27

Asset retirement obligation at March 31, 2019
 
1,945

Less current portion
 
(66
)
Asset retirement obligation, long-term
 
$
1,879