Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Revenues	$ 10,326	$ 9,374	$ 20,986	$ 19,322
Cost of sales	(5,782)	(5,269)	(11,571)	(10,820)
Demand creation expense	(881)	(910)	(1,899)	(1,874)
Other (income) expense, net	41	48	74	(5)
Interest expense (income), net	(12)	(14)	(27)	(25)
Income before income taxes	1,249	997	2,810	2,267
Tax benefit (expense)	(134)	(150)	(328)	(328)
AMOUNT OF GAIN (LOSS) RECLASSIFIED FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) INTO INCOME
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Gain (loss), net of tax	128	15	256	(29)
Gain (losses) on cash flow hedges | AMOUNT OF GAIN (LOSS) RECLASSIFIED FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) INTO INCOME
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	130	12	257	(38)
Tax benefit (expense)	(1)	(1)	(1)	(2)
Gain (loss), net of tax	129	11	256	(40)
Gain (losses) on cash flow hedges | Foreign exchange forwards and options | AMOUNT OF GAIN (LOSS) RECLASSIFIED FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) INTO INCOME
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Revenues	1	3	9	8
Cost of sales	102	10	177	(34)
Demand creation expense	(3)	0	(3)	0
Other (income) expense, net	31	0	77	(9)
Gain (losses) on cash flow hedges | Interest rate swaps | AMOUNT OF GAIN (LOSS) RECLASSIFIED FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) INTO INCOME
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense (income), net	(1)	(1)	(3)	(3)
OTHER | AMOUNT OF GAIN (LOSS) RECLASSIFIED FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) INTO INCOME
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	(1)	4	0	11
Income before income taxes	(1)	4	0	11
Tax benefit (expense)	0	0	0	0
Gain (loss), net of tax	$ (1)	$ 4	$ 0	$ 11