Asset Retirement Obligations (Notes)

12 Months Ended

Dec. 31, 2014

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations

Asset Retirement Obligations

The following summarizes the changes in asset retirement obligations:

(In millions)	2014			2013
Beginning balance	$	2,096		$	1,783
Incurred, including acquisitions	89			84
Settled, including dispositions(a)	(426		)	(78		)
Accretion expense (included in depreciation, depletion and amortization)	104			106
Revisions to previous estimates	95			244
Held for sale	—			(43		)
Ending balance(b)	$	1,958		$	2,096

^(a)  Includes the sale of our Norway business in the fourth quarter of 2014.

^(b)  Includes asset retirement obligations of $41 million and $87 million classified as short-term at December 31, 2014 and 2013.