Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
OPERATING ACTIVITIES
Net income	$ 3,972	$ 3,826	$ 5,231
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	4,176	3,970	3,793
Provision for uncollectible accounts	696	403	577
Other noncash items including leases and deferred income tax	3,472	2,931	2,887
Stock-based compensation	182	190	200
Retirement plans mark-to-market adjustments	(650)	1,578	(1,176)
Loss on extinguishment of debt			393
Goodwill and other asset impairment charges	117
Business optimization and realignment costs, net of payments	23	53	102
Changes in assets and liabilities:
Receivables	782	(310)	(1,389)
Other current assets	48	(158)	(40)
Pension and postretirement healthcare assets and liabilities, net	(623)	(697)	(317)
Accounts payable and other liabilities	(3,331)	(1,861)	71
Other, net	(16)	(93)	(197)
Cash provided by operating activities	8,848	9,832	10,135
INVESTING ACTIVITIES
Capital expenditures	(6,174)	(6,763)	(5,884)
Business acquisitions, net of cash acquired			(228)
Purchase of investments	(84)	(147)
Proceeds from asset dispositions and other	84	94	102
Cash used in investing activities	(6,174)	(6,816)	(6,010)
FINANCING ACTIVITIES
Principal payments on debt	(152)	(161)	(6,318)
Proceeds from debt issuances			4,212
Proceeds from stock issuances	231	184	740
Dividends paid	(1,177)	(793)	(686)
Purchase of treasury stock	(1,500)	(2,248)
Other, net	1	(1)	(38)
Cash used in financing activities	(2,597)	(3,019)	(2,090)
Effect of exchange rate changes on cash	(118)	(187)	171
Net (decrease) increase in cash and cash equivalents	(41)	(190)	2,206
Cash and cash equivalents at beginning of period	6,897	7,087	4,881
Cash and cash equivalents at end of period	$ 6,856	$ 6,897	$ 7,087