Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2012

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation [Table Text Block]

A reconciliation of the asset retirement obligations for 2012 follows:

	(In millions)
Asset retirement obligations at January 1, 2012	$	1,442
Accretion	91
Revision in estimated cash flows	2
Liabilities incurred	26
Liabilities settled	(4		)
Asset retirement obligations at December 31, 2012	$	1,557