Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
OPERATING ACTIVITIES
Net income	$ 4,331,000,000	$ 3,972,000,000	$ 3,826,000,000
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	4,287,000,000	4,176,000,000	3,970,000,000
Provision for uncollectible accounts	421,000,000	696,000,000	403,000,000
Other noncash items including leases and deferred income taxes	2,919,000,000	3,472,000,000	2,931,000,000
Stock-based compensation	163,000,000	182,000,000	190,000,000
Retirement plans mark-to-market adjustments	(561,000,000)	(650,000,000)	1,578,000,000
Goodwill and other asset impairment charges	157,000,000	117,000,000
Business optimization and realignment costs, net of payments	26,000,000	23,000,000	53,000,000
Changes in assets and liabilities:
Receivables	(270,000,000)	782,000,000	(310,000,000)
Other current assets	(43,000,000)	48,000,000	(158,000,000)
Pension and postretirement healthcare assets and liabilities, net	(522,000,000)	(623,000,000)	(697,000,000)
Accounts payable and other liabilities	(2,553,000,000)	(3,331,000,000)	(1,861,000,000)
Other, net	(43,000,000)	(16,000,000)	(93,000,000)
Cash provided by operating activities	8,312,000,000	8,848,000,000	9,832,000,000
INVESTING ACTIVITIES
Capital expenditures	(5,176,000,000)	(6,174,000,000)	(6,763,000,000)
Purchase of investments	(176,000,000)	(84,000,000)	(147,000,000)
Proceeds from sale of investments	38,000,000
Proceeds from asset dispositions and other	114,000,000	84,000,000	94,000,000
Cash used in investing activities	(5,200,000,000)	(6,174,000,000)	(6,816,000,000)
FINANCING ACTIVITIES
Principal payments on debt	(147,000,000)	(152,000,000)	(161,000,000)
Proceeds from stock issuances	491,000,000	231,000,000	184,000,000
Dividends paid	(1,259,000,000)	(1,177,000,000)	(793,000,000)
Purchase of treasury stock	(2,500,000,000)	(1,500,000,000)	(2,248,000,000)
Other, net	(11,000,000)	1,000,000	(1,000,000)
Cash used in financing activities	(3,426,000,000)	(2,597,000,000)	(3,019,000,000)
Effect of exchange rate changes on cash	(41,000,000)	(118,000,000)	(187,000,000)
Net decrease in cash and cash equivalents	(355,000,000)	(41,000,000)	(190,000,000)
Cash and cash equivalents at beginning of period	6,856,000,000	6,897,000,000	7,087,000,000
Cash and cash equivalents at end of period	$ 6,501,000,000	$ 6,856,000,000	$ 6,897,000,000