RISK MANAGEMENT AND DERIVATIVES - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Feb. 28, 2025	May 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Deferred net gains (net of tax) expected to be reclassified to Net Income during the next 12 months	$ 471
Maximum term over which the company hedges exposures to the variability of cash flows for its forecasted transactions	27 months
Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total notional amount of outstanding derivatives	$ 3,300	$ 4,400
Derivatives designated as cash flow hedges | Derivatives formally designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total notional amount of outstanding derivatives	14,700	16,200
Fair Value Hedging | Derivatives formally designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total notional amount of outstanding derivatives	$ 2,400	$ 1,800