Risk Management and Derivatives - Effects Of Cash Flow Hedges in Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Revenues	$ 9,611	$ 8,984	$ 28,933	$ 26,608
Cost of sales	5,272	5,046	16,092	15,030
Demand creation expense	865	862	2,739	2,594
Other (income) expense, net	(55)	(1)	(50)	35
Interest expense (income), net	12	13	37	42
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) on cash flow hedge activity	51	(48)	13	(31)
Foreign exchange forwards and options | Revenues | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) on cash flow hedge activity	1	9	9	24
Foreign exchange forwards and options | Cost of sales | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) on cash flow hedge activity	34	(41)	0	(17)
Foreign exchange forwards and options | Other (income) expense, net | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) on cash flow hedge activity	18	(15)	9	(33)
Interest rate swaps | Interest expense (income), net | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) on cash flow hedge activity	$ (2)	$ (1)	$ (5)	$ (5)