Pension Benefits - Schedule of Other Changes in Accumulated Other Comprehensive Income (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 0	$ (3)	$ 8
Amortization of:
Net actuarial loss	0	(129)	(9)
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)	0	(132)	(1)
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(9)	(24)	42
Amortization of:
Net actuarial loss	(35)	(6)	(5)
Prior service credit (cost)	1	0	0
Foreign exchange impact and other	15	(6)	(12)
Total recognized in net periodic benefit cost and other comprehensive loss (income)	$ (28)	$ (36)	$ 25