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Asset Retirement Obligation
 3 Months Ended
Mar. 31, 2016
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, 2016:
 
 
 
 
 
 
(In millions)
Asset retirement obligation at December 31, 2015
 
$
2,598

Liabilities incurred
 
1

Liabilities settled
 
(15
)
Accretion expense
 
38

Asset retirement obligation at March 31, 2016
 
2,622

Less current portion
 
36

Asset retirement obligation, long-term
 
$
2,586