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Asset Retirement Obligation (Tables)
 6 Months Ended
Jun. 30, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
The following table describes changes to the Company’s asset retirement obligation (ARO) liability for the six-month period ended June 30, 2017:
 
 
(In millions)
Asset retirement obligation at December 31, 2016
 
$
2,498

Liabilities incurred
 
38

Liabilities divested
 
(29
)
Liabilities settled
 
(21
)
Accretion expense
 
73

Revisions in estimated liabilities
 
66

Liabilities held for sale
 
(779
)
Asset retirement obligation at June 30, 2017
 
1,846

Less current portion
 
35

Asset retirement obligation, long-term
 
$
1,811