Pension Benefits - Schedule Of Projected Benefit Obligation, Accumulated Benefit Obligation And Fair Value Of Plan Assets For Pension Plans (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
United States
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 10	$ 439	$ 485
Accumulated benefit obligation	10	439
Fair value of plan assets	0	322	335
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	896	990	1,035
Accumulated benefit obligation	856	949
Fair value of plan assets	$ 594	$ 642	$ 687