ASSET RETIREMENT OBLIGATIONS (Tables)

3 Months Ended

Mar. 31, 2013

ASSET RETIREMENT OBLIGATIONS

Summary of the change in the carrying amount of the asset retirement obligations and the net book value of assets

	Quarters ended March 31,
(In millions)	2013			2012
Asset retirement obligation balance at beginning of period	$	20		$	21
Payments	(1		)	(1		)
Asset retirement obligation balance at end of period	$	19		$	20
Net book value of asset retirement obligation assets at end of period	$	—		$	1