Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Cash provided by operations:
Net income	$ 4,240	$ 3,760	$ 3,273
Income charges (credits) not affecting cash:
Depreciation	706	649	606
Deferred income taxes	(273)	(80)	(113)
Stock-based compensation	215	236	191
Amortization and other	10	13	43
Net foreign currency adjustments	(117)	98	424
Changes in certain working capital components and other assets and liabilities:
(Increase) decrease in accounts receivable	(426)	60	(216)
(Increase) in inventories	(231)	(590)	(621)
(Increase) in prepaid expenses and other current assets	(120)	(161)	(144)
(Decrease) increase in accounts payable, accrued liabilities and income taxes payable	(364)	(889)	1,237
Cash provided by operations	3,640	3,096	4,680
Cash used by investing activities:
Purchases of short-term investments	(5,928)	(5,367)	(4,936)
Maturities of short-term investments	3,623	2,924	3,655
Sales of short-term investments	2,423	2,386	2,216
Investments in reverse repurchase agreements	0	150	(150)
Additions to property, plant and equipment	(1,105)	(1,143)	(963)
Disposals of property, plant and equipment	13	10	3
Other investing activities	(34)	6	0
Cash used by investing activities	(1,008)	(1,034)	(175)
Cash used by financing activities:
Net proceeds from long-term debt issuance	1,482	981	0
Long-term debt payments, including current portion	(44)	(106)	(7)
Increase (decrease) in notes payable	327	(67)	(63)
Payments on capital lease and other financing obligations	(17)	(7)	(19)
Proceeds from exercise of stock options and other stock issuances	489	507	514
Excess tax benefits from share-based payment arrangements	177	281	218
Repurchase of common stock	(3,223)	(3,238)	(2,534)
Dividends — common and preferred	(1,133)	(1,022)	(899)
Cash used by financing activities	(1,942)	(2,671)	(2,790)
Effect of exchange rate changes on cash and equivalents	(20)	(105)	(83)
Net increase (decrease) in cash and equivalents	670	(714)	1,632
Cash and equivalents, beginning of year	3,138	3,852	2,220
CASH AND EQUIVALENTS, END OF YEAR	3,808	3,138	3,852
Cash paid during the year for:
Interest, net of capitalized interest	98	70	53
Income taxes	703	748	1,262
Non-cash additions to property, plant and equipment	266	252	206
Dividends declared and not paid	$ 300	$ 271	$ 240