Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2014

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligation

The following table describes changes to the Company’s asset retirement obligation (ARO) liability for the years ended December 31, 2014 and 2013:

	2014			2013
	(In millions)
Asset retirement obligation at beginning of year	$	3,222		$	4,578
Liabilities incurred		171			481
Liabilities acquired		—			53
Liabilities divested		(471	)		(1,692	)
Liabilities settled		(146	)		(497	)
Accretion expense		181			243
Revisions in estimated liabilities		128			56
Asset retirement obligation at end of year		3,085			3,222
Less current portion		(37	)		(121	)
Asset retirement obligation, long-term	$	3,048		$	3,101