Pension Benefits - Schedule Of Amounts Recognized In Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	Mar. 31, 2016	Mar. 31, 2015
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 185	$ 220
Prior service credit	0	0
Total	185	220
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	133	175
Prior service credit	(11)	(6)
Total	$ 122	$ 169