RESTRUCTURING ACTIVITIES (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Restructuring reserve [Line Items]
Restructuring expenses		$ 91	$ 161	$ 506	$ 346
Accrued at period start	[1],[2]			264
Initial Costs	[1],[3]			528
Adjustments to Cost	[1],[4]			(22)
Cash Payments	[1]			(452)
Others	[1],[5]			13
Accrued at period end	[1],[2]	331		331
Fiscal 2017 Oracle Restructuring [Member]
Restructuring reserve [Line Items]
Total expected program costs		1,100		1,100
Restructuring expenses				516
Remaining expenses to incur		112		$ 112
Expected completion date				May 31, 2018
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	1,114		$ 1,114
Accrued at period start	[1],[2]			185
Initial Costs	[1],[3]			527
Adjustments to Cost	[1],[4]			(11)
Cash Payments	[1]			(422)
Others	[1],[5]			8
Accrued at period end	[1],[2]	287		287
Total Costs Accrued to Date	[1]	1,002		1,002
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member] | Cloud and on-premise software [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	300		300
Accrued at period start	[1],[2]			85
Initial Costs	[1],[3]			111
Adjustments to Cost	[1],[4]			(8)
Cash Payments	[1]			(129)
Others	[1],[5]			6
Accrued at period end	[1],[2]	65		65
Total Costs Accrued to Date	[1]	281		281
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member] | Hardware [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	241		241
Accrued at period start	[1],[2]			31
Initial Costs	[1],[3]			146
Adjustments to Cost	[1],[4]			(7)
Cash Payments	[1]			(89)
Others	[1],[5]			4
Accrued at period end	[1],[2]	85		85
Total Costs Accrued to Date	[1]	227		227
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member] | Services [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	130		130
Accrued at period start	[1],[2]			25
Initial Costs	[1],[3]			40
Adjustments to Cost	[1],[4]			(3)
Cash Payments	[1]			(45)
Others	[1],[5]			2
Accrued at period end	[1],[2]	19		19
Total Costs Accrued to Date	[1]	95		95
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member] | Other [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	443		443
Accrued at period start	[1],[2]			44
Initial Costs	[1],[3]			230
Adjustments to Cost	[1],[4]			7
Cash Payments	[1]			(159)
Others	[1],[5]			(4)
Accrued at period end	[1],[2]	118		118
Total Costs Accrued to Date	[1]	399		399
Other Restructuring Plans [Member] | Fiscal 2017 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2],[6]			79
Initial Costs	[1],[3],[6]			1
Adjustments to Cost	[1],[4],[6]			(11)
Cash Payments	[1],[6]			(30)
Others	[1],[5],[6]			5
Accrued at period end	[1],[2],[6]	$ 44		$ 44

[1] Restructuring costs recorded for individual line items primarily related to employee severance costs.

[2] The balances at February 28, 2018 and May 31, 2017 included $298 million and $242 million, respectively, recorded in other current liabilities, and $33 million and $22 million, respectively, recorded in other non-current liabilities.

[3] Costs recorded for the respective restructuring plans during the current period presented.

[4] All plan adjustments were changes in estimates whereby increases and decreases in costs were generally recorded to operating expenses in the period of adjustments.

[5] Represents foreign currency translation and certain other adjustments.

[6] Other restructuring plans presented in the table above included condensed information for other Oracle based plans and other plans associated with certain of our acquisitions whereby we continued to make cash outlays to settle obligations under these plans during the period presented but for which the periodic impact to our condensed consolidated statements of operations was not significant.