Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other expense (income), net	$ (139)	$ 78	$ (66)
Interest expense (income), net	(89)	(49)	(54)
Revenues	37,403	39,117	36,397
Cost of sales	(21,162)	(21,643)	(20,441)
Demand creation expense	(3,592)	(3,753)	(3,577)
Income before income taxes	2,887	4,801	4,325
Tax benefit (expense)	(348)	(772)	$ (2,392)
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	517	87
Gains (losses) on foreign currency translation adjustment | AMOUNT OF GAIN (LOSS) RECLASSIFIED FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) INTO INCOME
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other expense (income), net	(1)	0
Income before income taxes	(1)	0
Tax benefit (expense)	0	0
Gain (loss), net of tax	(1)	0
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	519	76
Tax benefit (expense)	(2)	(6)
Gain (loss), net of tax	517	70
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]
Other expense (income), net	181	35
Revenues	(17)	(5)
Cost of sales	364	53
Demand creation expense	(2)	0
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	(7)	(7)
OTHER | AMOUNT OF GAIN (LOSS) RECLASSIFIED FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) INTO INCOME
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other expense (income), net	1	17
Income before income taxes	1	17
Tax benefit (expense)	0	0
Gain (loss), net of tax	$ 1	$ 17