Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Operating Activities:
Net income	$ 1,112	$ 1,245
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	971	926
Provision for uncollectible accounts	117	143
Stock-based compensation	69	75
Other noncash items including leases and deferred income taxes	884	531
Business realignment costs	36
Changes in assets and liabilities:
Receivables	726	(387)
Other assets	(171)	(30)
Accounts payable and other liabilities	(1,616)	198
Other, net	(44)	(50)
Cash provided by operating activities	2,084	2,651
Investing Activities:
Capital expenditures	(1,570)	(1,424)
Proceeds from asset dispositions and other	20	6
Cash used in investing activities	(1,550)	(1,418)
Financing Activities:
Principal payments on debt	(64)	(45)
Proceeds from debt issuances		959
Proceeds from stock issuances	84	82
Dividends paid	(200)	(170)
Purchase of treasury stock	(549)
Other, net	(1)	(1)
Cash (used in) provided by financing activities	(730)	825
Effect of exchange rate changes on cash	(38)	15
Net (decrease) increase in cash and cash equivalents	(234)	2,073
Cash and cash equivalents at beginning of period	7,087	4,881
Cash and cash equivalents at end of period	$ 6,853	$ 6,954