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, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Revenues	$ 11,243	$ 10,326	$ 21,837	$ 20,986
Cost of sales	6,396	5,782	12,249	11,571
Demand creation expense	729	881	1,406	1,899
Other (income) expense, net	54	(41)	40	(74)
Interest expense (income), net	70	12	135	27
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY	43	130	178	257
Foreign exchange forwards and options \| Revenue \| Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF GAIN (LOSS) ON CASH FLOW HEDGE ACTIVITY	26	1	40	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	31	102	145	177
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	(3)	1	(3)
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	(13)	31	(5)	77
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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