Risk Management and Derivatives - Effects Of Cash Flow Hedges in Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Revenues	$ 9,948	$ 9,070
Cost of sales	5,551	5,108
Demand creation expense	964	855
Other expense (income), net	53	18
Interest expense (income), net	11	16
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) on cash flow hedge activity	(50)	47
Foreign exchange forwards and options | Revenues | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) on cash flow hedge activity	5	2
Foreign exchange forwards and options | Cost of sales | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) on cash flow hedge activity	(44)	45
Foreign exchange forwards and options | Total selling and administrative expense | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) on cash flow hedge activity	0	0
Foreign exchange forwards and options | Other expense (income), net | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) on cash flow hedge activity	(9)	2
Interest rate swaps | Interest expense (income), net | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) on cash flow hedge activity	$ (2)	$ (2)