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Leases - Summary of Components of Net Lease Cost (Details)
$ in Millions
 3 Months Ended
Aug. 31, 2019
USD ($)
Leases [Abstract]  
Operating lease cost $ 674 [1]
Finance lease cost:  
Amortization of right-of-use assets 3
Interest on lease liabilities 1
Total finance lease cost 4
Short-term lease cost 35
Variable lease cost 267 [1]
Net lease cost $ 980
[1] Expenses are primarily accounted for in the “Rentals and landing fees” line item. Additional amounts related to embedded leases are accounted for in the “Purchased transportation,” “Fuel” and “Other” line items in the unaudited condensed consolidated statements of income.