Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2024	Aug. 31, 2023
Operating Activities:
Net income	$ 794	$ 1,078
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	1,078	1,071
Provision for uncollectible accounts	129	103
Other noncash items including leases and deferred income taxes	817	728
Stock-based compensation	48	56
Business optimization costs, net of payments	(69)	(73)
Changes in assets and liabilities:
Receivables	(305)	(126)
Other assets	(223)	(131)
Accounts payable and other liabilities	(1,105)	(470)
Other, net	23	(6)
Cash provided by operating activities	1,187	2,230
Investing Activities:
Capital expenditures	(767)	(1,290)
Purchase of investments	(61)	(2)
Proceeds from sale of investments	13	0
Proceeds from asset dispositions and other	13	12
Cash used in investing activities	(802)	(1,280)
Financing Activities:
Principal payments on debt	(34)	(66)
Proceeds from stock issuances	404	157
Dividends paid	(339)	(318)
Purchase of treasury stock	(1,000)	(500)
Cash used in financing activities	(969)	(727)
Effect of exchange rate changes on cash	26	(24)
Net (decrease) increase in cash and cash equivalents	(558)	199
Cash and cash equivalents at beginning of period	6,501	6,856
Cash and cash equivalents at end of period	$ 5,943	$ 7,055