Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2024	Aug. 31, 2023
Income Statement [Abstract]
REVENUE	$ 21,579	$ 21,681
OPERATING EXPENSES:
Salaries and employee benefits	7,785	7,785
Purchased transportation	5,275	5,036
Rentals and landing fees	1,161	1,151
Depreciation and amortization	1,078	1,071
Fuel	1,075	1,101
Maintenance and repairs	829	824
Business optimization costs	128	105
Other	3,168	3,123
OPERATING EXPENSES	20,499	20,196
OPERATING INCOME	1,080	1,485
OTHER (EXPENSE) INCOME:
Interest, net	(84)	(91)
Other retirement plans, net	49	39
Other, net	11	(10)
OTHER (EXPENSE) INCOME	(24)	(62)
INCOME BEFORE INCOME TAXES	1,056	1,423
PROVISION FOR INCOME TAXES	262	345
NET INCOME	$ 794	$ 1,078
EARNINGS PER COMMON SHARE:
Basic	$ 3.24	$ 4.28
Diluted	3.21	4.23
DIVIDENDS DECLARED PER COMMON SHARE	$ 2.76	$ 1.26