Pension Benefits - Schedule Of Net Periodic Expense For Pension Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	$ 4	$ 1	$ 4
Interest cost on projected benefit obligation	18	19	19
Expected return on assets	(19)	(21)	(20)
Amortization of unrecognized actuarial loss, prior service costs and net transitional obligation	42	19	32
Curtailment/settlement loss (gain)	2	0	0
Net periodic expense	47	18	35
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	20	16	6
Interest cost on projected benefit obligation	24	34	11
Expected return on assets	(30)	(30)	(12)
Amortization of unrecognized actuarial loss, prior service costs and net transitional obligation	3	3	4
Curtailment/settlement loss (gain)	0	6	(1)
Net periodic expense	$ 17	$ 29	$ 8