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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Mar. 31, 2021
Operating Lease, Supplemental Balance Sheet Information [Abstract]    
Operating right-of-use assets, net $ 1,174 $ 1,366
Current operating lease liabilities 392 418
Non-current operating lease liabilities 862 1,038
Total operating lease liabilities $ 1,254 $ 1,456
Weighted-average operating lease term 4 years 7 months 6 days 4 years 10 months 24 days
Weighted-average operating lease discount rate 3.50% 3.80%
Finance Lease, Supplemental Balance Sheet Information [Abstract]    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property and equipment, net of accumulated depreciation of $4,073 and $4,121 Property and equipment, net of accumulated depreciation of $4,073 and $4,121
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Short-term debt and current maturities of long-term debt Short-term debt and current maturities of long-term debt
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-term Debt, Excluding Current Maturities Long-term Debt, Excluding Current Maturities
ROU finance lease assets $ 736 $ 834
Finance lease, liability, current 334 398
Finance lease, liability, noncurrent 395 496
Total finance lease liabilities $ 729 $ 894
Weighted-average finance lease term 2 years 7 months 6 days 2 years 7 months 6 days
Weighted-average finance lease discount rate 3.20% 3.60%