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Property, Plant and Equipment (Details 2) (USD $) In Millions, unless otherwise specified	0 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended
	Apr. 01, 2011	Dec. 31, 2011	Dec. 31, 2012	Mar. 31, 2011 Predecessor
Asset retirement obligation activity
Balance at the beginning of the period			$ 62	$ 63
Accretion expense		5	4	2
Liabilities settled and other		(3)	(1)	(1)
Change in estimate		(38)	(6)
Balance at the end of the period	98	62	59	64
Additional disclosure
Fair value adjustment	$ 34

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement 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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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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