Pension Benefits - Schedule Of Changes In Benefit Obligations And Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
U.S. Plans
Change in benefit obligations
Benefit obligation at beginning of period	$ 583	$ 540
Service cost	4	1	$ 4
Interest cost	18	19	19
Actuarial loss (gain)	(13)	53
Benefit payments	(54)	(30)
Amendments	0	0
Expenses paid	(3)	0
Foreign exchange impact and other	0	0
Benefit obligation at end of period	535	583	540
Change in plan assets
Fair value of plan assets at beginning of period	298	300
Actual return on plan assets	(3)	16
Employer and participant contributions	24	12
Benefits paid	(54)	(30)
Expenses paid	(3)	0
Foreign exchange impact and other	0	0
Fair value of plan assets at end of period	262	298	300
Funded status at end of period	(273)	(285)
Amounts recognized on the balance sheet
Assets	0	0
Current liabilities	(2)	(17)
Long-term liabilities	(271)	(268)
Total	(273)	(285)
Non-U.S. Plans
Change in benefit obligations
Benefit obligation at beginning of period	963	934
Service cost	20	16	6
Interest cost	24	34	11
Actuarial loss (gain)	(64)	194
Benefit payments	(35)	(49)
Amendments	(2)	(6)
Expenses paid	0	0
Foreign exchange impact and other	(7)	(160)
Benefit obligation at end of period	899	963	934
Change in plan assets
Fair value of plan assets at beginning of period	612	590
Actual return on plan assets	2	88
Employer and participant contributions	44	73
Benefits paid	(35)	(49)
Expenses paid	0	0
Foreign exchange impact and other	(16)	(90)
Fair value of plan assets at end of period	607	612	$ 590
Funded status at end of period	(292)	(351)
Amounts recognized on the balance sheet
Assets	21	0
Current liabilities	(11)	(6)
Long-term liabilities	(302)	(345)
Total	$ (292)	$ (351)