Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
Cash provided by operations:
Net income	$ 1,249	$ 1,179
Income charges (credits) not affecting cash:
Depreciation	173	154
Deferred income taxes	(50)	(31)
Stock-based compensation	57	54
Amortization and other	7	11
Net foreign currency adjustments	(61)	32
Changes in certain working capital components and other assets and liabilities:
(Increase) decrease in accounts receivable	(284)	52
(Increase) in inventories	(62)	(100)
(Increase) in prepaid expenses and other current assets	(63)	(73)
(Decrease) in accounts payable, accrued liabilities and income taxes payable	(245)	(787)
Cash provided by operations	721	491
Cash used by investing activities:
Purchases of short-term investments	(1,279)	(1,188)
Maturities of short-term investments	562	721
Sales of short-term investments	960	450
Investments in reverse repurchase agreements	0	(50)
Additions to property, plant and equipment	(277)	(327)
Disposals of property, plant and equipment	0	9
Other investing activities	(42)	0
Cash used by investing activities	(76)	(385)
Cash used by financing activities:
Long-term debt payments, including current portion	(2)	(1)
Increase (decrease) in notes payable	21	(48)
Payments on capital lease obligations	(2)	0
Proceeds from exercise of stock options and other stock issuances	112	128
Excess tax benefits from share-based payment arrangements	59	75
Repurchase of common stock	(1,054)	(588)
Dividends — common and preferred	(269)	(240)
Cash used by financing activities	(1,135)	(674)
Effect of exchange rate changes on cash and equivalents	11	(38)
Net decrease in cash and equivalents	(479)	(606)
Cash and equivalents, beginning of period	3,138	3,852
CASH AND EQUIVALENTS, END OF PERIOD	2,659	3,246
Supplemental disclosure of cash flow information:
Non-cash additions to property, plant and equipment	96	152
Dividends declared and not paid	$ 272	$ 239