Financial Instruments (Tables)

6 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Schedule of carrying amount and estimated fair values of our exchangeable notes as well as current and long-term debt

The following table presents carrying amounts and estimated fair values of current and long-term debt:

	Successor
	Carrying amount at September 30, 2014		Estimated Fair Value Using Input Type
			Quoted prices in active markets		Observable		Unobservable		Total estimated fair value
	(in millions)
Current and long-term debt	$	31,816	$	26,595	$	4,954	$	1,135	$	32,684

	Successor
	Carrying amount at March 31, 2014		Estimated Fair Value Using Input Type
			Quoted prices in active markets		Observable		Unobservable		Total estimated fair value
	(in millions)
Current and long-term debt	$	32,277	$	27,516	$	5,421	$	1,262	$	34,199