Risk Management and Derivatives - Effects Of Cash Flow Hedges in Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Derivative Instruments, Gain (Loss) [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
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY	131	51	388	13
Foreign exchange forwards and options | Revenue | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY	(21)	1	(12)	9
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	110	34	287	0
Foreign exchange forwards and options | Demand creation expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY	0	0	(3)	0
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	44	18	121	9
Interest rate swaps | Interest (income) expense, net | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY	$ (2)	$ (2)	$ (5)	$ (5)