Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Operating cash flows from operating leases	$ (339)	$ (338)	$ (356)
Operating cash flows from finance leases	(1)	(1)	0
Financing cash flows from finance leases	(47)	(29)	(31)
Operating leases	391	462	286
Finance leases	$ 21	$ 17	$ 32