Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other expense (income), net	$ 78	$ (66)	$ 196
Interest expense (income), net	(49)	(54)	(59)
Revenues	39,117	36,397	34,350
Cost of sales	(21,643)	(20,441)	(19,038)
Selling and administrative expense	(12,702)	(11,511)	(10,563)
Income before income taxes	4,801	4,325	4,886
Tax benefit (expense)	(772)	(2,392)	$ (646)
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	87	(160)
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	76	(131)
Tax benefit (expense)	(6)	3
Gain (loss), net of tax	70	(128)
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	35	(69)
Revenues	(5)	34
Cost of sales	53	(90)
Selling and administrative expense	0	1
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	17	(32)
Income before income taxes	17	(32)
Tax benefit (expense)	0	0
Gain (loss), net of tax	$ 17	$ (32)