Pension Benefits - Schedule Of Changes In Benefit Obligations And Plan Assets (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
United States
Change in benefit obligations
Benefit obligation at beginning of period	$ 439	$ 485
Service cost	0	0	$ 3
Interest cost	6	14	14
Actuarial loss (gain)	20	4
Benefits paid	(179)	(64)
Annuity Premium Transfer	(276)	0
Expenses paid	0	0
Acquisitions	0	0
Foreign exchange impact and other	0	0
Benefit obligation at end of period	10	439	485
Change in plan assets
Fair value of plan assets at beginning of period	322	335
Actual return on plan assets	27	12
Employer and participant contributions	116	39
Benefits paid	(179)	(64)
Annuity Premium Transfer	(276)	0
Expenses paid	0	0
Foreign exchange impact and other	(10)	0
Fair value of plan assets at end of period	0	322	335
Funded status at end of period	(10)	(117)
Amounts recognized on the balance sheet
Assets	0	7
Current liabilities	(1)	(115)
Long-term liabilities	(9)	(9)
Total	(10)	(117)
Non-U.S. Plans
Change in benefit obligations
Benefit obligation at beginning of period	990	1,035
Service cost	16	15	15
Interest cost	19	21	22
Actuarial loss (gain)	(36)	35
Benefits paid	(43)	(36)
Annuity Premium Transfer	0	0
Expenses paid	0	(1)
Acquisitions	2	1
Foreign exchange impact and other	(52)	(80)
Benefit obligation at end of period	896	990	1,035
Change in plan assets
Fair value of plan assets at beginning of period	642	687
Actual return on plan assets	3	18
Employer and participant contributions	28	23
Benefits paid	(43)	(36)
Annuity Premium Transfer	0	0
Expenses paid	(1)	(1)
Foreign exchange impact and other	(35)	(49)
Fair value of plan assets at end of period	594	642	$ 687
Funded status at end of period	(302)	(348)
Amounts recognized on the balance sheet
Assets	49	20
Current liabilities	(162)	(13)
Long-term liabilities	(189)	(355)
Total	$ (302)	$ (348)