Pension Benefits - Schedule Of Other Changes In Accumulated Other Comprehensive Income (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
United States
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ (3)	$ 8	$ (15)
Prior service credit	0	0	0
Amortization of:
Net actuarial loss	(129)	(9)	(8)
Prior service credit (cost)	0	0	0
Foreign exchange impact and other	0	0	0
Total recognized in net periodic benefit cost and other comprehensive loss (income)	(132)	(1)	(23)
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(24)	42	(11)
Prior service credit	0	0	(2)
Amortization of:
Net actuarial loss	(6)	(5)	(6)
Prior service credit (cost)	0	0	0
Foreign exchange impact and other	(6)	(12)	19
Total recognized in net periodic benefit cost and other comprehensive loss (income)	$ (36)	$ 25	$ 0