Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2022	Aug. 31, 2021
Income Statement [Abstract]
REVENUE	$ 23,242	$ 22,003
OPERATING EXPENSES:
Salaries and employee benefits	7,859	7,776
Purchased transportation	5,767	5,659
Rentals and landing fees	1,159	1,133
Depreciation and amortization	1,024	971
Fuel	1,822	1,009
Maintenance and repairs	904	869
Business realignment and optimization costs	38	67
Other	3,478	3,121
OPERATING EXPENSES	22,051	20,605
OPERATING INCOME	1,191	1,398
OTHER (EXPENSE) INCOME:
Interest, net	(142)	(160)
Other retirement plans income	101	216
Other, net	4	3
OTHER (EXPENSE) INCOME	(37)	59
INCOME BEFORE INCOME TAXES	1,154	1,457
PROVISION FOR INCOME TAXES	279	345
NET INCOME	$ 875	$ 1,112
EARNINGS PER COMMON SHARE:
Basic	$ 3.37	$ 4.17
Diluted	3.33	4.09
DIVIDENDS DECLARED PER COMMON SHARE	$ 2.30	$ 1.50