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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Mar. 31, 2022
Operating Lease, Supplemental Balance Sheet Information [Abstract]    
Operating right-of-use assets, net $ 927 $ 1,133
Current operating lease liabilities 318 388
Non-current operating lease liabilities 667 815
Total operating lease liabilities $ 985 $ 1,203
Weighted-average operating lease term 4 years 1 month 6 days 4 years 4 months 24 days
Weighted-average operating lease discount rate 3.60% 3.30%
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 $3,866 and $3,998 Property and equipment, net of accumulated depreciation of $3,866 and $3,998
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 finance lease liabilities Long-term debt, excluding finance lease liabilities
ROU finance lease assets $ 474 $ 602
Finance lease, liability, current 235 289
Finance lease, liability, noncurrent 294 354
Total finance lease liabilities $ 529 $ 643
Weighted-average finance lease term 2 years 9 months 18 days 2 years 9 months 18 days
Weighted-average finance lease discount rate 3.00% 2.90%