EMPLOYEE BENEFIT PLANS Narrative (Details)	1 Months Ended		12 Months Ended
	Apr. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	May 31, 2023 Tranche shares	May 31, 2013 shares	May 31, 2022 shares	May 31, 2021 shares	May 31, 2020 shares
Stock-based Payment Award [Line Items]
Options outstanding			64,000,000		97,000,000	107,000,000	176,000,000
Options outstanding vested			34,000,000
Restricted stock-based awards outstanding			152,000,000		128,000,000	110,000,000	101,000,000
Stock options outstanding			15,000,000
Performance-based stock options [Member]
Stock-based Payment Award [Line Items]
Number of vesting tranches granted that potentially may vest | Tranche			7
Number of tranches vests on attainment of market-based metric | Tranche			1
Number of vesting tranches require attainment of both a performance and a market condition | Tranche			6
Extended expiration period			3 years
Performance-based stock options [Member] | Minimum [Member]
Stock-based Payment Award [Line Items]
Award service period for market-based metric			1 year
Performance-based stock options [Member] | Maximum [Member]
Stock-based Payment Award [Line Items]
Award service period for market-based metric			2 years
2020 Plan [Member]
Stock-based Payment Award [Line Items]
Number of shares authorized			390,000,000
Increase in number of authorized shares of stock that may be issued			300,000,000
Shares of common stock available for future awards			208,000,000
2020 and 2000 Plan [Member]
Stock-based Payment Award [Line Items]
Vesting percentage			25.00%
Vesting period			4 years
Expiration period			10 years
2020 and 2000 Plan [Member] | Service-based stock options [Member]
Stock-based Payment Award [Line Items]
Options outstanding			28,000,000
2020 and 2000 Plan [Member] | Restricted Stock Units [Member]
Stock-based Payment Award [Line Items]
Equivalent number of shares deducted against share pool (in actual number of shares)			2.5
2020 and 2000 Plan [Member] | Performance-based stock options [Member]
Stock-based Payment Award [Line Items]
Options outstanding vested			6,000,000
Restricted stock-based awards outstanding			146,000,000
Stock options outstanding			36,000,000
Acquired plans [Member]
Stock-based Payment Award [Line Items]
Options outstanding			459,000
Restricted stock-based awards outstanding			3,000,000
Directors' Plan [Member]
Stock-based Payment Award [Line Items]
Increase in number of authorized shares of stock that may be issued				2,000,000
Vesting period			4 years
Expiration period			10 years
Options outstanding			339,000
Shares of common stock available for future awards			1,000,000
Directors' Plan [Member] | Restricted Stock Units [Member]
Stock-based Payment Award [Line Items]
Restricted stock-based awards outstanding			40,000
Maximum value of annual grants | $	$ 350,000	$ 400,000
Plan 2000 [Member]
Stock-based Payment Award [Line Items]
Shares of common stock available for future awards			132,921,827