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Asset Retirement Obligations (Notes)

3 Months Ended

Mar. 31, 2013

Asset Retirement Obligation [Abstract]

A reconciliation of the asset retirement obligations for the three months ended March 31, 2013 follows:



	(In millions)
Asset retirement obligations at December 31, 2012	$	1,719
Accretion	26
Asset retirement obligations at March 31, 2013	$	1,745

- Definition

The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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