Pension Benefits - Schedule Of Other Changes In Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Amortization of:
Net actuarial loss	$ (47)
Prior service credit (cost)	1
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	9	$ 58	$ (31)
Prior service credit	0	0	(8)
Amortization of:
Net actuarial loss	(44)	(27)	(32)
Prior service credit (cost)	0	8	0
Foreign exchange impact and other	0	0	(1)
Total recognized in net periodic benefit cost and other comprehensive loss (income)	(35)	39	(72)
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(38)	117	12
Prior service credit	(5)	(8)	0
Amortization of:
Net actuarial loss	(5)	(5)	(4)
Prior service credit (cost)	2	2	2
Foreign exchange impact and other	(1)	(8)	4
Total recognized in net periodic benefit cost and other comprehensive loss (income)	$ (47)	$ 98	$ 14