Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Feb. 28, 2023	Feb. 28, 2022
Operating Activities:
Net income	$ 2,434	$ 3,268
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	3,101	2,952
Provision for uncollectible accounts	536	327
Stock-based compensation	142	151
Retirement plans mark-to-market adjustments		260
Other noncash items including leases and deferred income taxes	2,425	2,498
Business optimization and realignment costs/(payments), net	20	128
Changes in assets and liabilities:
Receivables	373	(66)
Other assets	(110)	(235)
Accounts payable and other liabilities	(3,534)	(2,892)
Other, net	14	(61)
Cash provided by operating activities	5,401	6,330
Investing Activities:
Capital expenditures	(4,420)	(4,379)
Purchase of investments	(82)	(145)
Proceeds from asset dispositions and other	72	71
Cash used in investing activities	(4,430)	(4,453)
Financing Activities:
Principal payments on debt	(123)	(113)
Proceeds from stock issuances	114	151
Dividends paid	(888)	(598)
Purchase of treasury stock	(1,500)	(2,248)
Other, net	1
Cash used in financing activities	(2,396)	(2,808)
Effect of exchange rate changes on cash	(99)	(91)
Net (decrease) increase in cash and cash equivalents	(1,524)	(1,022)
Cash and cash equivalents at beginning of period	6,897	7,087
Cash and cash equivalents at end of period	$ 5,373	$ 6,065