Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2014

Asset Retirement Obligation [Abstract]

Schedule Of Asset Retirement Obligations

	2014			2013
	(in millions)
Asset retirement obligation at January 1	$	134		$	101
Accretion of discount		7			6
Obligations incurred		64	(1)		22
Obligations settled/removed		(4)			(2)
Revisions of estimates		6			7
Asset retirement obligation at December 31	$	207		$	134
Current liability		9			6
Long-term liability		198			128
Asset retirement obligation at December 31	$	207		$	134

⁽¹⁾ Obligations incurred include $42 million related to the Chesapeake Property Acquisition.