Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Feb. 28, 2022	Feb. 28, 2021
Operating Activities:
Net income	$ 3,268	$ 3,363
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	2,952	2,818
Provision for uncollectible accounts	327	428
Stock-based compensation	151	161
Retirement plans mark-to-market adjustments	260	52
Other noncash items including leases and deferred income taxes	2,498	2,020
Business realignment costs	128
Changes in assets and liabilities:
Receivables	(66)	(1,187)
Other assets	(235)	(165)
Accounts payable and other liabilities	(2,892)	63
Other, net	(61)	(161)
Cash provided by operating activities	6,330	7,392
Investing Activities:
Capital expenditures	(4,379)	(4,202)
Business acquisitions, net of cash acquired		(225)
Purchase of investments	(145)
Proceeds from asset dispositions and other	71	88
Cash used in investing activities	(4,453)	(4,339)
Financing Activities:
Principal payments on debt	(113)	(105)
Proceeds from debt issuances		970
Proceeds from stock issuances	151	482
Dividends paid	(598)	(513)
Purchase of treasury stock	(2,248)
Other, net		(13)
Cash (used in) provided by financing activities	(2,808)	821
Effect of exchange rate changes on cash	(91)	101
Net (decrease) increase in cash and cash equivalents	(1,022)	3,975
Cash and cash equivalents at beginning of period	7,087	4,881
Cash and cash equivalents at end of period	$ 6,065	$ 8,856