Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Operating Activities:
Net income	$ 1,245	$ 745
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	926	879
Provision for uncollectible accounts	143	105
Stock-based compensation	75	67
Other noncash items and deferred income taxes	531	694
Changes in assets and liabilities:
Receivables	(387)	(267)
Other assets	(30)	(118)
Accounts payable and other liabilities	198	(1,537)
Other, net	(50)	(3)
Cash provided by operating activities	2,651	565
Investing Activities:
Capital expenditures	(1,424)	(1,418)
Proceeds from asset dispositions and other	6	(1)
Cash used in investing activities	(1,418)	(1,419)
Financing Activities:
Principal payments on debt	(45)	(985)
Proceeds from debt issuances	959	2,093
Proceeds from stock issuances	82	12
Dividends paid	(170)	(170)
Purchase of treasury stock		(3)
Other, net	(1)	(5)
Cash provided by financing activities	825	942
Effect of exchange rate changes on cash	15	(18)
Net increase in cash and cash equivalents	2,073	70
Cash and cash equivalents at beginning of period	4,881	2,319
Cash and cash equivalents at end of period	$ 6,954	$ 2,389