Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2014

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

A reconciliation of the asset retirement obligations for 2014 follows:

	(In millions)
Asset retirement obligations at December 31, 2013	$	1,667
Accretion	103
Liabilities incurred	9
Liabilities settled	(6		)
Revision in estimated cash flows	23
Asset retirement obligations at December 31, 2014	$	1,796