Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2015	Aug. 31, 2014
Operating Activities:
Net income	$ 692	$ 653
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	648	651
Provision for uncollectible accounts	28	35
Stock-based compensation	53	48
Deferred income taxes and other noncash items	20	(22)
Changes in assets and liabilities:
Receivables	50	(86)
Other assets	(89)	(30)
Accounts payable and other liabilities	(151)	(257)
Other, net	(10)	(10)
Cash provided by operating activities	1,241	982
Investing Activities:
Capital expenditures	(1,209)	(720)
Proceeds from asset dispositions and other	10	4
Cash used in investing activities	(1,199)	(716)
Financing Activities:
Principal payments on debt	(15)
Proceeds from stock issuances	46	97
Excess tax benefit on the exercise of stock options	6	10
Dividends paid	(71)	(57)
Purchase of treasury stock	(190)	(791)
Cash used in financing activities	(224)	(741)
Effect of exchange rate changes on cash	(38)	(17)
Net decrease in cash and cash equivalents	(220)	(492)
Cash and cash equivalents at beginning of period	3,763	2,908
Cash and cash equivalents at end of period	$ 3,543	$ 2,416