Unaudited Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Nov. 30, 2014	Nov. 30, 2013
Cash provided by operations:
Net income	$ 1,617	$ 1,313
Income charges (credits) not affecting cash:
Depreciation	301	246
Deferred income taxes	49	24
Stock-based compensation (Note 6)	92	88
Amortization and other	(54)	51
Changes in certain working capital components and other assets and liabilities:
(Increase) in accounts receivable	(177)	(89)
(Increase) in inventories	(318)	(277)
(Increase) in prepaid expenses and other current assets	(58)	(125)
(Decrease) in accounts payable, accrued liabilities and income taxes payable	(217)	(283)
Cash provided by operations	1,235	948
Cash used by investing activities:
Purchases of short-term investments	(2,588)	(2,848)
Maturities of short-term investments	1,862	1,662
Sales of short-term investments	1,045	546
Investments in reverse repurchase agreements	0	(100)
Additions to property, plant and equipment	(487)	(449)
Disposals of property, plant and equipment	2	1
Increase in other assets, net of other liabilities	0	(1)
Cash used by investing activities	(166)	(1,189)
Cash used by financing activities:
Long-term debt payments, including current portion	(4)	(57)
(Decrease) increase in notes payable	(58)	59
Payments on capital lease obligations	(12)	0
Proceeds from exercise of stock options and other stock issuances	313	233
Excess tax benefits from share-based payment arrangements	116	71
Repurchase of common stock	(1,243)	(928)
Dividends — common and preferred	(416)	(375)
Cash used by financing activities	(1,304)	(997)
Effect of exchange rate changes	288	(13)
Net increase (decrease) in cash and equivalents	53	(1,251)
Cash and equivalents, beginning of period	2,220	3,337
CASH AND EQUIVALENTS, END OF PERIOD	2,273	2,086
Cash paid during the year for:
Non-cash additions to property, plant and equipment	141	117
Dividends declared and not paid	$ 242	$ 213