Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Nov. 30, 2017	Nov. 30, 2016
Cash provided by operations:
Net income	$ 1,717	$ 2,091
Income charges (credits) not affecting cash:
Depreciation	366	346
Deferred income taxes	(83)	(70)
Stock-based compensation	103	111
Amortization and other	10	12
Net foreign currency adjustments	(67)	(34)
Changes in certain working capital components and other assets and liabilities:
Decrease (increase) in accounts receivable	143	(318)
(Increase) in inventories	(243)	(300)
(Increase) in prepaid expenses and other current assets	(208)	(85)
Increase in accounts payable, accrued liabilities and income taxes payable	160	17
Cash provided by operations	1,898	1,770
Cash (used) provided by investing activities:
Purchases of short-term investments	(3,002)	(2,358)
Maturities of short-term investments	2,229	1,743
Sales of short-term investments	1,044	1,404
Additions to property, plant and equipment	(498)	(512)
Disposals of property, plant and equipment	1	12
Other investing activities	0	(53)
Cash (used) provided by investing activities	(226)	236
Cash used by financing activities:
Net proceeds from long-term debt issuance	0	1,482
Long-term debt payments, including current portion	(3)	(3)
Increase in notes payable	904	21
Payments on capital lease and other financing obligations	(11)	(6)
Proceeds from exercise of stock options and other stock issuances	320	238
Repurchase of common stock	(1,776)	(1,954)
Dividends — common and preferred	(595)	(536)
Tax payments for net share settlement of equity awards	(53)	(8)
Cash used by financing activities	(1,214)	(766)
Effect of exchange rate changes on cash and equivalents	38	(39)
Net increase in cash and equivalents	496	1,201
Cash and equivalents, beginning of period	3,808	3,138
CASH AND EQUIVALENTS, END OF PERIOD	4,304	4,339
Supplemental disclosure of cash flow information:
Non-cash additions to property, plant and equipment	92	120
Dividends declared and not paid	$ 325	$ 304