Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2015	Aug. 31, 2014
Cash provided by operations:
Net income	$ 1,179	$ 962
Income charges (credits) not affecting cash:
Depreciation	154	147
Deferred income taxes	(31)	35
Stock-based compensation (Note 7)	54	43
Amortization and other	11	8
Net foreign currency adjustments	32	53
Changes in certain working capital components and other assets and liabilities:
Decrease (increase) in accounts receivable	52	(203)
(Increase) in inventories	(100)	(111)
(Increase) in prepaid expenses and other current assets	(73)	0
(Decrease) in accounts payable, accrued liabilities and income taxes payable	(787)	(251)
Cash provided by operations	491	683
Cash (used) provided by investing activities:
Purchases of short-term investments	(1,188)	(1,296)
Maturities of short-term investments	721	1,074
Sales of short-term investments	450	762
Investments in reverse repurchase agreements	(50)	0
Additions to property, plant and equipment	(327)	(262)
Disposals of property, plant and equipment	9	2
Cash (used) provided by investing activities	(385)	280
Cash used by financing activities:
Long-term debt payments, including current portion	(1)	(2)
(Decrease) in notes payable	(48)	(17)
Payments on capital lease obligations	0	(6)
Proceeds from exercise of stock options and other stock issuances	128	127
Excess tax benefits from share-based payment arrangements	75	44
Repurchase of common stock	(588)	(819)
Dividends — common and preferred	(240)	(209)
Cash used by financing activities	(674)	(882)
Effect of exchange rate changes on cash and equivalents	(38)	2
Net (decrease) increase in cash and equivalents	(606)	83
Cash and equivalents, beginning of period	3,852	2,220
CASH AND EQUIVALENTS, END OF PERIOD	3,246	2,303
Supplemental disclosure of cash flow information:
Non-cash additions to property, plant and equipment	152	125
Dividends declared and not paid	$ 239	$ 207