EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		May 31, 2021	May 31, 2020	May 31, 2019
Shares Under Restricted Stock-based Awards [Abstract]
Beginning balance		101	99	89
Granted		54	50	53
Vested and Issued		(34)	(34)	(31)
Canceled		(11)	(14)	(12)
Ending balance		110	101	99
Weighted Average Grant Date Fair Value [Abstract]
Total grant date fair value of restricted stock-based awards, vested and issued		$ 1,600	$ 1,500	$ 1,300
Beginning balance		$ 48.36	$ 43.01	$ 42.93
Granted		54.95	53.38	42.47
Vested and Issued		46.88	42.67	41.85
Canceled		50.40	46.81	42.97
Ending balance		$ 51.87	$ 48.36	$ 43.01
Unrecognized compensation expense related to non-vested restricted stock-based awards		$ 3,700
Shares Under Stock Option [Abstract]
Beginning balance		176	222	304
Granted		0	0	7
Exercised		(52)	(44)	(72)
Canceled		(17)	(2)	(17)
Ending balance		107	176	222
Vested		67
Expected to vest	[1]	9
Total		76
Weighted Average Exercise Price [Abstract]
Beginning balance		$ 38.86	$ 37.78	$ 36.11
Granted		0	0	43.47
Exercised		32.05	33.18	28.32
Canceled		51.02	44.76	49.28
Ending balance		40.14	$ 38.86	$ 37.78
Vested		34.05
Expected to vest	[1]	48.70
Total		$ 35.76
Weighted Average Remaining Contract Term (in years) [Abstract]
Vested		2 years 6 months 14 days
Expected to vest	[1]	5 years 9 months 3 days
Total		2 years 10 months 28 days
Aggregate Intrinsic Value (in millions) [Abstract]
Vested	[2]	$ 3,000
Expected to vest	[1],[2]	266
Total	[2]	$ 3,266
Closing stock price		$ 78.74
Unrecognized compensation expense for shares expected to vest		$ 17
Shares not expected to vest		31
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation		$ 1,837	$ 1,590	$ 1,653
Estimated income tax benefit included in provision for income taxes		(413)	(343)	(358)
Total stock-based compensation, net of estimated income tax benefit		1,424	1,247	1,295
Other Postretirement Plans [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total defined benefit plan pension expense		105	97	$ 90
Aggregate projected benefit obligation		1,400	1,300
Aggregate net liability (funded status)		$ 889	$ 884
Employee Stock Purchase Plan [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Stock purchase price as a percentage of the fair market value on the purchase date		95.00%
Shares reserved for future issuances under the purchase plan		42
Common stock issued under stock purchase plans		2	2	2
Cloud services and license support [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation		$ 134	$ 110	$ 99
Hardware [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation		11	11	10
Services [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation		55	54	49
Sales and marketing [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation		313	261	360
Research and development [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation		1,188	1,035	963
General and administrative [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation		$ 136	$ 119	$ 172
Restricted Stock Units [Member]
Weighted Average Grant Date Fair Value [Abstract]
Weighted average recognition period of unrecognized compensation expense for shares expected to vest		2 years 9 months 3 days
Employee Stock Options [Member]
Weighted Average Grant Date Fair Value [Abstract]
Weighted average recognition period of unrecognized compensation expense for shares expected to vest		1 year 5 months 8 days

[1] The unrecognized compensation expense calculated under the fair value method for shares expected to vest (unvested shares net of expected forfeitures) as of May 31, 2021 was approximately $17 million and is expected to be recognized over a weighted-average period of 1.44 years. Approximately 31 million shares outstanding as of May 31, 2021 were not expected to vest.

[2] The aggregate intrinsic value was calculated based on the gross difference between our closing stock price on the last trading day of fiscal 2021 of $78.74 and the exercise prices for all “in-the-money” options outstanding, excluding tax effects.