Pension Benefits - Schedule of Changes in Benefit Obligations and Plan Assets (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
UNITED STATES
Change in benefit obligations
Benefit obligation at beginning of period	$ 10	$ 439
Service cost	0	0	$ 0
Interest cost	0	6	14
Actuarial loss (gain)	0	20
Benefits paid	(1)	(179)
Annuity Premium Transfer	0	(276)
Divestiture	0	0
Acquisitions	0	0
Foreign exchange impact and other	0	0
Benefit obligation at end of period	9	10	439
Change in plan assets
Fair value of plan assets at beginning of period	0	322
Actual return on plan assets	0	27
Employer and participant contributions	1	116
Benefits paid	(1)	(179)
Annuity Premium Transfer	0	(276)
Foreign exchange impact and other	0	(10)
Fair value of plan assets at end of period	0	0	322
Funded status at end of period	(9)	(10)
Amounts recognized on the balance sheet
Assets	0	0
Current liabilities	(1)	(1)
Long-term liabilities	(8)	(9)
Total	(9)	(10)
Non-U.S. Plans
Change in benefit obligations
Benefit obligation at beginning of period	896	990
Service cost	15	16	15
Interest cost	19	19	21
Actuarial loss (gain)	89	(36)
Benefits paid	(34)	(43)
Annuity Premium Transfer	0	0
Divestiture	(187)	0
Acquisitions	0	2
Foreign exchange impact and other	77	(52)
Benefit obligation at end of period	875	896	990
Change in plan assets
Fair value of plan assets at beginning of period	594	642
Actual return on plan assets	87	3
Employer and participant contributions	27	28
Benefits paid	(34)	(43)
Annuity Premium Transfer	0	0
Foreign exchange impact and other	61	(36)
Fair value of plan assets at end of period	735	594	$ 642
Funded status at end of period	(140)	(302)
Amounts recognized on the balance sheet
Assets	54	49
Current liabilities	(9)	(162)
Long-term liabilities	(185)	(189)
Total	$ (140)	$ (302)