Unaudited Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Cash provided by operations:
Net income	$ 780	$ 567
Income charges (credits) not affecting cash:
Depreciation	122	104
Deferred income taxes	24	(17)
Stock-based compensation (Note 7)	42	37
Amortization and other	31	33
Changes in certain working capital components and other assets and liabilities:
(Increase) in accounts receivable	(102)	(123)
(Increase) in inventories	(63)	(17)
(Increase) in prepaid expenses and other current assets	(102)	(63)
(Decrease) increase in accounts payable, accrued liabilities and income taxes	(135)	14
Cash provided by operations	597	535
Cash (used) provided by investing activities:
Purchases of short-term investments	(1,328)	(654)
Maturities of short-term investments	818	324
Sales of short-term investments	436	663
Investments in reverse repurchase agreements	(100)	0
Additions to property, plant and equipment	(215)	(107)
Disposals of property, plant and equipment	1	0
Increase in other assets, net of other liabilities	(4)	(5)
Cash (used) provided by investing activities	(392)	221
Cash used by financing activities:
Long-term debt payments, including current portion	(2)	(42)
(Decrease) increase in notes payable	(3)	19
Proceeds from exercise of stock options and other stock issuances	94	39
Excess tax benefits from share-based payment arrangements	27	8
Repurchase of common stock	(526)	(766)
Dividends — common and preferred	(188)	(165)
Cash used by financing activities	(598)	(907)
Effect of exchange rate changes	(8)	(1)
Net (decrease) in cash and equivalents	(401)	(152)
Cash and equivalents, beginning of period	3,337
CASH AND EQUIVALENTS, END OF PERIOD	2,936	2,165
Cash paid during the year for:
Dividends declared and not paid	$ 187	$ 162