CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	May 31, 2026	May 31, 2025	May 31, 2024
Income Statement [Abstract]
REVENUE	$ 94,720	$ 87,926	$ 87,693
OPERATING EXPENSES:
Salaries and employee benefits	33,844	31,232	30,961
Purchased transportation	23,620	21,768	20,921
Rentals and landing fees	4,883	4,647	4,571
Depreciation and amortization	4,369	4,264	4,287
Fuel	4,052	3,775	4,710
Maintenance and repairs	3,330	3,245	3,291
Separation and other costs	771	38	0
Business optimization and realignment costs	366	756	582
Goodwill and other asset impairment charges	23	21	157
Other	13,999	12,963	12,654
Total operating expenses	89,257	82,709	82,134
OPERATING INCOME	5,463	5,217	5,559
OTHER INCOME (EXPENSE):
Interest expense	(970)	(789)	(745)
Other retirement plans income	885	713	722
Interest income	437	363	370
Other, net	(22)	(63)	(70)
Total other (expense) income	330	224	277
INCOME BEFORE INCOME TAXES	5,793	5,441	5,836
PROVISION FOR INCOME TAXES	1,360	1,349	1,505
NET INCOME	$ 4,433	$ 4,092	$ 4,331
EARNINGS PER COMMON SHARE:
Basic (in dollar per share)	$ 18.71	$ 16.96	$ 17.41
Diluted (in dollar per share)	$ 18.55	$ 16.81	$ 17.21

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	May 31, 2026	May 31, 2025	May 31, 2024
OPERATING ACTIVITIES
Net income	$ 4,433	$ 4,092	$ 4,331
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	4,369	4,264	4,287
Provision for uncollectible accounts	946	521	421
Other noncash items including leases and deferred income taxes	2,937	3,156	2,919
Stock-based compensation	177	154	163
Retirement plans mark-to-market adjustments	(647)	(515)	(561)
Goodwill and other asset impairment charges	23	21	157
Separation and other costs, net of payments	248	15	0
Business optimization and realignment costs, net of payments	(48)	43	26
Changes in assets and liabilities:
Receivables	(2,247)	(1,780)	(270)
Other current assets	(121)	90	(43)
Pension and postretirement healthcare assets and liabilities, net	(169)	(553)	(522)
Accounts payable and other liabilities	(933)	(2,460)	(2,553)
Other, net	(43)	(12)	(43)
Cash provided by operating activities	8,925	7,036	8,312
INVESTING ACTIVITIES
Capital expenditures	(3,809)	(4,055)	(5,176)
Purchase of investments	(682)	(262)	(176)
Proceeds from sale of investments	483	110	38
Proceeds from asset dispositions, and other investing activities, net	97	115	114
Cash used in investing activities	(3,911)	(4,092)	(5,200)
FINANCING ACTIVITIES
Proceeds from debt issuances	5,289	0	0
Short-term borrowings, net	742	0	0
Principal payments on debt	(2,049)	(157)	(147)
Proceeds from stock issuances	992	524	491
Dividends paid	(1,374)	(1,339)	(1,259)
Purchase of common stock	(796)	(3,017)	(2,500)
Other, net	(55)	(30)	(11)
Cash provided by (used in) financing activities	2,749	(4,019)	(3,426)
Effect of exchange rate changes on cash	46	76	(41)
Net increase (decrease) in cash and cash equivalents	7,809	(999)	(355)
Cash and cash equivalents at beginning of period	5,502	6,501	6,856
Cash and cash equivalents at end of period	$ 13,311	$ 5,502	$ 6,501

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	May 31, 2026	May 31, 2025
CURRENT ASSETS
Cash and cash equivalents	$ 13,311	$ 5,502
Receivables, less allowances of $864 and $773	12,672	11,368
Spare parts, supplies, and fuel, less allowances of $324 and $308	669	602
Prepaid expenses and other	1,251	914
Total current assets	27,903	18,386
PROPERTY AND EQUIPMENT, AT COST
Aircraft and related equipment	32,107	31,584
Package handling and ground support equipment	19,816	18,878
Information technology	9,942	9,706
Vehicles and trailers	11,150	10,949
Facilities and other	17,911	16,505
Total property and equipment, at cost	90,926	87,622
Less accumulated depreciation and amortization	48,882	45,980
Net property and equipment	42,044	41,642
OTHER LONG-TERM ASSETS
Operating lease right-of-use assets, net	16,822	16,453
Goodwill	6,733	6,603
Other assets	5,435	4,543
Total other long-term assets	28,990	27,599
TOTAL ASSETS	98,937	87,627
CURRENT LIABILITIES
Accrued expenses	5,725	4,995
Accounts payable	4,327	3,692
Accrued salaries and employee benefits	3,759	2,731
Operating lease liabilities	2,680	2,565
Current portion of long-term debt	1,676	1,428
Short-term borrowings	745	0
Total current liabilities	18,912	15,411
LONG-TERM DEBT, LESS CURRENT PORTION	23,293	19,151
OTHER LONG-TERM LIABILITIES
Operating lease liabilities	14,549	14,272
Self-insurance accruals	4,413	4,033
Deferred income taxes	3,664	4,205
Pension, postretirement healthcare, and other benefit obligations	1,625	1,698
Other liabilities	834	783
Total other long-term liabilities	25,085	24,991
COMMITMENTS AND CONTINGENCIES
COMMON STOCKHOLDERS’ INVESTMENT
Preferred Stock, Value, Issued	0	0
Common stock, $0.10 par value; 800 million shares authorized; 318 million shares issued as of May 31, 2026 and 2025	32	32
Additional paid-in capital	4,717	4,290
Retained earnings	44,461	41,402
Accumulated other comprehensive loss	(1,227)	(1,362)
Treasury stock, at cost; 78 million shares as of May 31, 2026 and 80 million shares as of May 31, 2025	(16,336)	(16,288)
Total common stockholders’ investment	31,647	28,074
TOTAL LIABILITIES AND COMMON STOCKHOLDERS’ INVESTMENT	$ 98,937	$ 87,627