CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Cash provided by operations:
Net income	$ 1,114	$ 1,016
Income charges (credits) not affecting cash:
Depreciation	178	161
Deferred income taxes	(1)	(3)
Stock-based compensation	61	50
Amortization and other	20	14
Changes in certain working capital components and other assets and liabilities:
(Increase) decrease in accounts receivable	(91)	(36)
(Increase) decrease in inventories	(555)	(252)
(Increase) decrease in prepaid expenses and other assets	(55)	10
(Decrease) increase in accounts payable, accrued liabilities and income taxes	(74)	(313)
Cash provided by operations	597	647
Cash provided (used) by investing activities:
Purchases of investments	(1,523)	(3,363)
Maturities of investments	1,582	1,838
Sales of investments	1,076	561
Additions to property, plant and equipment	(259)	(191)
Proceeds from the sale of property, plant and equipment	1	0
Increase in other assets and liabilities, net	(37)	(4)
Settlement of net investment hedges	(8)	(12)
Cash provided (used) by investing activities	832	(1,171)
Cash used by financing activities:
Reduction in long-term debt, including current portion	(134)	(4)
Decrease in notes payable	(49)	(15)
Proceeds from exercise of stock options and other stock issuances	284	228
Excess tax benefits from share-based payment arrangements	59	40
Repurchase of common stock	(1,325)	(785)
Dividends on common stock	(289)	(260)
Cash used by financing activities	(1,454)	(796)
Effect of exchange rate changes on cash	(1)	9
Net decrease in cash and equivalents	(26)	(1,311)
Cash and equivalents, beginning of period	1,955	3,079
Cash and equivalents, end of period	1,929	1,768
Supplemental disclosure of cash flow information:
Dividends declared and not paid	$ 165	$ 148