Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023
Operating leases
Operating lease right-of-use assets	$ 1,729	$ 1,635
Current portion of operating lease liabilities	295	299
Long-term operating lease liabilities	1,466	1,402
Total operating lease liabilities	1,761	1,701
Finance leases
Property, plant, and equipment, net	$ 165	$ 180
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, plant, and equipment, net	Property, plant, and equipment, net
Current portion of long-term debt	$ 30	$ 29
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Less: Current portion	Less: Current portion
Long-term debt	$ 163	$ 173
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt	Long-term debt
Total finance lease liabilities	$ 193	$ 202
Weighted-average remaining lease term (years)
Operating leases	7 years	6 years 10 months 24 days
Finance leases	7 years	7 years 9 months 18 days
Weighted-average discount rate
Operating leases	3.62%	3.03%
Finance leases	2.98%	2.66%