XML 54 R32.htm IDEA: XBRL DOCUMENT v3.8.0.1
ASSET RETIREMENT OBLIGATION (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017 and 2016:
 
 
 
2017
 
2016
 
 
(In millions)
Asset retirement obligation at beginning of year
 
$
2,498

 
$
2,598

Liabilities incurred
 
58

 
41

Liabilities divested
 
(818
)
 
(7
)
Liabilities settled
 
(45
)
 
(57
)
Accretion expense
 
130

 
156

Revisions in estimated liabilities
 
12

 
(233
)
Asset retirement obligation at end of year
 
1,835

 
2,498

Less current portion
 
(43
)
 
(66
)
Asset retirement obligation, long-term
 
$
1,792

 
$
2,432