Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended		3 Months Ended
	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2011 Predecessor
Capital Leases
Assets acquired through capital leases	$ 2	$ 0	$ 0	$ 16
Depreciation expense	41	42	50	11
Cash payments towards capital leases		40	41
Assets included in property, plant and equipment		168	188
Accumulated depreciation		109	85
Capital lease obligations:
2014		33
2015		23
2016		2
2017		1
2018		1
2019 and thereafter		5
Total minimum payments		65
Less: amount representing interest and executory costs		(10)
Present value of minimum payments		55
Less: current portion		(31)
Long-term portion		$ 24