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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Income Statement [Abstract]    
REVENUE $ 22,244 $ 21,579
OPERATING EXPENSES:    
Salaries and employee benefits 8,062 7,785
Purchased transportation 5,488 5,275
Rentals and landing fees 1,192 1,161
Depreciation and amortization 1,092 1,078
Fuel 873 1,075
Maintenance and repairs 843 829
Separation and other costs 45 0
Business optimization costs 67 128
Other 3,396 3,168
Total operating expenses 21,058 20,499
OPERATING INCOME 1,186 1,080
OTHER (EXPENSE) INCOME:    
Interest, net (119) (84)
Other retirement plans, net 60 49
Other, net 7 11
Total other (expense) income (52) (24)
INCOME BEFORE INCOME TAXES 1,134 1,056
PROVISION FOR INCOME TAXES 310 262
NET INCOME $ 824 $ 794
EARNINGS PER COMMON SHARE:    
Basic (in dollars per share) $ 3.48 $ 3.24
Diluted (in dollars per share) 3.46 3.21
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share) $ 2.90 $ 2.76