Risk Management and Derivatives - Effects Of Cash Flow Hedges in Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Revenues	$ 10,326	$ 9,374	$ 20,986	$ 19,322
Cost of sales	5,782	5,269	11,571	10,820
Demand creation expense	881	910	1,899	1,874
Other (income) expense, net	(41)	(48)	(74)	5
Interest expense (income), net	12	14	27	25
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY	130	12	257	(38)
Foreign exchange forwards and options \| Revenue \| Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY	1	3	9	8
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	102	10	177	(34)
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)	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	31	0	77	(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	$ (1)	$ (1)	$ (3)	$ (3)

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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