Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other expense (income), net	$ 33	$ (53)
Interest expense (income), net	(15)	(11)
Revenues	10,660	9,948
Cost of sales	(5,789)	(5,551)
Income before income taxes	1,561	1,270
Tax benefit (expense)	(194)	(178)
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	(44)
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	127	(50)
Tax benefit (expense)	0	(1)
Gain (loss), net of tax	127	(51)
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	46	(9)
Revenues	8	5
Cost of sales	75	(44)
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)
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	7
Income before income taxes	1	7
Tax benefit (expense)	0	0
Gain (loss), net of tax	$ 1	$ 7