Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 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 the three months ended March 31, 2012 follows:

	(In millions)
Asset retirement obligations at January 1, 2012	$	1,593
Accretion	24
Liabilities settled	(2		)
Asset retirement obligations at March 31, 2012	1,615