Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Revenues	$ 10,104	$ 9,611	$ 31,090	$ 28,933
Cost of sales	(5,631)	(5,272)	(17,202)	(16,092)
Demand creation expense	(870)	(865)	(2,769)	(2,739)
Other (income) expense, net	(297)	55	(223)	50
Interest expense (income), net	(12)	(12)	(39)	(37)
Income before income taxes	881	1,291	3,691	3,558
Tax benefit (expense)	(34)	(190)	(362)	(518)
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	130	45	386	16
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 (income) expense, net	(1)	0	(1)	0
Income before income taxes	(1)	0	(1)	0
Tax benefit (expense)	0	0	0	0
Gain (loss), net of tax	(1)	0	(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	131	51	388	13
Tax benefit (expense)	0	(3)	(1)	(5)
Gain (loss), net of tax	131	48	387	8
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	(21)	1	(12)	9
Cost of sales	110	34	287	0
Demand creation expense	0	0	(3)	0
Other (income) expense, net	44	18	121	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	(2)	(2)	(5)	(5)
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	0	(3)	0	8
Income before income taxes	0	(3)	0	8
Tax benefit (expense)	0	0	0	0
Gain (loss), net of tax	$ 0	$ (3)	$ 0	$ 8