Risk Management and Derivatives - Effects Of Cash Flow Hedges in Statement of Income (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Revenues	$ 44,538	$ 37,403	$ 39,117
Cost of sales	24,576	21,162	21,643
Demand creation expense	3,114	3,592	3,753
Other (income) expense, net	14	139	(78)
Interest expense (income), net	262	89	49
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY	45	519	76
Foreign exchange forwards and options | Revenue | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY	45	(17)	(5)
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	51	364	53
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	3	(2)	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	(47)	181	35
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	$ (7)	$ (7)	$ (7)