CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2025	Nov. 30, 2024	Nov. 30, 2025	Nov. 30, 2024
Income Statement [Abstract]
REVENUE	$ 23,469	$ 21,967	$ 45,713	$ 43,546
OPERATING EXPENSES:
Salaries and employee benefits	8,395	7,879	16,457	15,664
Purchased transportation	5,885	5,500	11,373	10,775
Rentals and landing fees	1,211	1,168	2,403	2,329
Depreciation and amortization	1,068	1,063	2,160	2,141
Fuel	889	947	1,762	2,022
Maintenance and repairs	889	831	1,732	1,660
Separation and other costs	213	0	258	0
Business optimization costs	30	326	97	454
Other	3,511	3,201	6,907	6,369
Total operating expenses	22,091	20,915	43,149	41,414
OPERATING INCOME	1,378	1,052	2,564	2,132
OTHER (EXPENSE) INCOME:
Interest, net	(135)	(102)	(254)	(186)
Other retirement plans, net	59	50	119	99
Other, net	(13)	(19)	(6)	(8)
Total other (expense) income	(89)	(71)	(141)	(95)
INCOME BEFORE INCOME TAXES	1,289	981	2,423	2,037
PROVISION FOR INCOME TAXES	333	240	643	502
NET INCOME	$ 956	$ 741	$ 1,780	$ 1,535
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 4.07	$ 3.06	$ 7.55	$ 6.30
Diluted (in dollars per share)	4.04	3.03	7.50	6.24
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 1.45	$ 1.38	$ 4.35	$ 4.14