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Asset Retirement Obligation (Tables)
 6 Months Ended
Jun. 30, 2016
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, 2016:
 
 
(In millions)
Asset retirement obligation at December 31, 2015
 
$
2,598

Liabilities incurred
 
6

Liabilities acquired
 
34

Liabilities settled
 
(31
)
Accretion expense
 
76

Revisions in estimated liabilities
 
59

Asset retirement obligation at June 30, 2016
 
2,742

Less current portion
 
36

Asset retirement obligation, long-term
 
$
2,706