EMPLOYEE BENEFIT PLANS Continued (Details) - shares	12 Months Ended
	May 31, 2017		May 31, 2016		May 31, 2015	May 31, 2014	May 31, 2013	May 31, 2011
Stock-based Payment Award [Line Items]
Options outstanding	312,000,000		375,000,000		413,000,000	462,000,000
Options outstanding vested	238,000,000
Restricted stock-based awards outstanding	83,000,000		52,000,000		28,000,000	1,000,000
Restricted stock-based awards granted (in shares)	42,000,000		34,000,000		28,000,000
Restricted stock-based awards vested (in shares)	18,000,000		7,000,000
Stock options granted	18,000,000	[1]	25,000,000	[1]	34,000,000
Performance-based restricted stock units [Member]
Stock-based Payment Award [Line Items]
Restricted stock-based awards outstanding	5,500,000
Restricted stock-based awards granted (in shares)	2,000,000		2,000,000		3,000,000
Restricted stock-based awards vested (in shares)	1,200,000
Minimum percentage for performance metric	0.00%
Maximum percentage that can exceed target performance metric	150.00%
Chief Technology Officer and Chief Executive Officers [Member]
Stock-based Payment Award [Line Items]
Expiration period	5 years
Stock options granted	7,000,000		7,000,000
Other Stock Options [Member]
Stock-based Payment Award [Line Items]
Expiration period	10 years
2000 Plan [Member]
Stock-based Payment Award [Line Items]
Increase in number of authorized shares of stock that may be issued						305,000,000		388,313,015
Vesting period	4 years
Expiration period	10 years
Options outstanding	305,000,000
Options outstanding vested	232,000,000
Shares of common stock available for future awards	217,000,000
2000 Plan [Member] | Restricted Stock Units [Member]
Stock-based Payment Award [Line Items]
Restricted stock-based awards outstanding	68,000,000
Equivalent number of shares deducted against share pool (in actual number of shares)	2.5
2000 Plan [Member] | Performance-based restricted stock units [Member]
Stock-based Payment Award [Line Items]
Restricted stock-based awards outstanding	6,000,000
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	2,000,000
Options outstanding vested	1,000,000
Shares of common stock available for future awards	2,000,000
Directors' Plan [Member] | Restricted Stock Units [Member]
Stock-based Payment Award [Line Items]
Restricted stock-based awards outstanding	110,000
Acquired plans [Member]
Stock-based Payment Award [Line Items]
Options outstanding	5,000,000
Acquired plans [Member] | Restricted Stock Units [Member]
Stock-based Payment Award [Line Items]
Restricted stock-based awards outstanding	9,000,000

[1] Approximately 7 million of the 18 million stock options granted during fiscal 2017 and 7 million of the 25 million stock options granted during fiscal 2016 were to our Chief Executive Officers and Chief Technology Officer and have contractual lives of five years versus the 10-year contractual lives for most of the other stock options granted.