Unaudited Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2014	Aug. 31, 2013
Cash provided by operations:
Net income	$ 962	$ 779
Income charges (credits) not affecting cash:
Depreciation	147	122
Deferred income taxes	35	24
Stock-based compensation (Note 6)	43	42
Amortization and other	(34)	30
Changes in certain working capital components and other assets and liabilities:
(Increase) in accounts receivable	(203)	(102)
(Increase) in inventories	(111)	(61)
(Increase) in prepaid expenses and other current assets	0	(102)
(Decrease) in accounts payable, accrued liabilities and income taxes	(251)	(114)
Cash provided by operations	588	618
Cash provided (used) by investing activities:
Purchases of short-term investments	(1,296)	(1,417)
Maturities of short-term investments	1,074	818
Sales of short-term investments	762	250
Investments in reverse repurchase agreements	0	(100)
Additions to property, plant and equipment	(262)	(245)
Disposals of property, plant and equipment	2	1
Increase in other assets, net of other liabilities	0	(1)
Cash provided (used) by investing activities	280	(694)
Cash used by financing activities:
Long-term debt payments, including current portion	(2)	(2)
(Decrease) increase in notes payable	(17)	3
Payments on capital lease obligations	(6)	0
Proceeds from exercise of stock options and other stock issuances	127	94
Excess tax benefits from share-based payment arrangements	44	27
Repurchase of common stock	(819)	(526)
Dividends — common and preferred	(209)	(188)
Cash used by financing activities	(882)	(592)
Effect of exchange rate changes	97	(8)
Net increase (decrease) in cash and equivalents	83	(676)
Cash and equivalents, beginning of period	2,220	3,337
CASH AND EQUIVALENTS, END OF PERIOD	2,303	2,661
Cash paid during the year for:
Non-cash additions to property, plant and equipment	125	107
Dividends declared and not paid	$ 207	$ 187