CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Millions, unless otherwise specified	Predecessor [Member]	Successor [Member]	Successor [Member] Common Stock [Member]	Successor [Member] Additional Paid-in Capital [Member]	Successor [Member] Retained Earnings [Member]	Successor [Member] Accumulated Other Comprehensive Loss [Member]
Balance at Mar. 31, 2014		$ 25,312	$ 39	$ 27,354	$ (2,038)	$ (43)
Balance (in shares) at Mar. 31, 2014			3,941
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(742)			(742)
Other Comprehensive Income (Loss), Net of Tax		(7)				(7)
Stock Issued During Period, Shares, New Issues			14
Stock Issued During Period, Value, New Issues		46	1	45
Stock Issued During Period, Value, Treasury Stock Reissued					0
Share-based compensation expense		54		54
Balance at Sep. 30, 2014		24,663	40	27,453	(2,780)	(50)
Balance (in shares) at Sep. 30, 2014			3,955
Balance at Jun. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(765)
Other Comprehensive Income (Loss), Net of Tax		(7)
Balance at Sep. 30, 2014		$ 24,663