RESTRUCTURING ACTIVITIES (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2020		May 31, 2019		May 31, 2018
Restructuring reserve [Line Items]
Restructuring expenses		$ 250		$ 443		$ 588
Accrued at period start	[1]	262	[2]	282		264
Initial Costs	[1],[3]	278		480		639
Adjustments to Cost	[1],[4]	(28)		(57)		(51)
Cash Payments	[1]	(299)		(443)		(571)
Others	[1],[5]	(62)		0		1
Accrued at period end	[1]	151	[2]	262	[2]	282
Fiscal 2019 Oracle Restructuring [Member]
Restructuring reserve [Line Items]
Restructuring expenses		261		476
Remaining restructuring expenses to incur		105
Fiscal 2019 Oracle Restructuring [Member] | Fiscal 2020 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2]	213
Initial Costs	[1],[3]	278
Adjustments to Cost	[1],[4]	(17)
Cash Payments	[1]	(291)
Others	[1],[5]	(45)
Accrued at period end	[1],[2]	138		213
Total Costs Accrued to Date	[1]	737
Total Expected Program Costs	[1]	842
Fiscal 2019 Oracle Restructuring [Member] | Fiscal 2020 Activity [Member] | Other [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2],[6]	108
Initial Costs	[1],[3],[6]	59
Adjustments to Cost	[1],[4],[6]	10
Cash Payments	[1],[6]	(111)
Others	[1],[5],[6]	(44)
Accrued at period end	[1],[2],[6]	22		108
Total Costs Accrued to Date	[1],[6]	263
Total Expected Program Costs	[1],[6]	266
Fiscal 2019 Oracle Restructuring [Member] | Fiscal 2020 Activity [Member] | Cloud and License [Member] | Operating Segments [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2]	72
Initial Costs	[1],[3]	140
Adjustments to Cost	[1],[4]	(24)
Cash Payments	[1]	(112)
Others	[1],[5]	(1)
Accrued at period end	[1],[2]	75		72
Total Costs Accrued to Date	[1]	303
Total Expected Program Costs	[1]	370
Fiscal 2019 Oracle Restructuring [Member] | Fiscal 2020 Activity [Member] | Hardware [Member] | Operating Segments [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2]	18
Initial Costs	[1],[3]	28
Adjustments to Cost	[1],[4]	(1)
Cash Payments	[1]	(31)
Others	[1],[5]	0
Accrued at period end	[1],[2]	14		18
Total Costs Accrued to Date	[1]	80
Total Expected Program Costs	[1]	83
Fiscal 2019 Oracle Restructuring [Member] | Fiscal 2020 Activity [Member] | Services [Member] | Operating Segments [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2]	15
Initial Costs	[1],[3]	51
Adjustments to Cost	[1],[4]	(2)
Cash Payments	[1]	(37)
Others	[1],[5]	0
Accrued at period end	[1],[2]	27		15
Total Costs Accrued to Date	[1]	91
Total Expected Program Costs	[1]	123
Fiscal 2019 Oracle Restructuring [Member] | Fiscal 2019 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]	213	[2]	0
Initial Costs	[1],[3]			475
Adjustments to Cost	[1],[4]			1
Cash Payments	[1]			(262)
Others	[1],[5]			(1)
Accrued at period end	[1]			213	[2]	0
Fiscal 2019 Oracle Restructuring [Member] | Fiscal 2019 Activity [Member] | Other [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[6]	108	[2]	0
Initial Costs	[1],[3],[6]			190
Adjustments to Cost	[1],[4],[6]			4
Cash Payments	[1],[6]			(87)
Others	[1],[5],[6]			1
Accrued at period end	[1],[6]			108	[2]	0
Fiscal 2019 Oracle Restructuring [Member] | Fiscal 2019 Activity [Member] | Cloud and License [Member] | Operating Segments [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]	72	[2]	0
Initial Costs	[1],[3]			191
Adjustments to Cost	[1],[4]			(4)
Cash Payments	[1]			(113)
Others	[1],[5]			(2)
Accrued at period end	[1]			72	[2]	0
Fiscal 2019 Oracle Restructuring [Member] | Fiscal 2019 Activity [Member] | Hardware [Member] | Operating Segments [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]	18	[2]	0
Initial Costs	[1],[3]			53
Adjustments to Cost	[1],[4]			0
Cash Payments	[1]			(35)
Others	[1],[5]			0
Accrued at period end	[1]			18	[2]	0
Fiscal 2019 Oracle Restructuring [Member] | Fiscal 2019 Activity [Member] | Services [Member] | Operating Segments [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]	$ 15	[2]	0
Initial Costs	[1],[3]			41
Adjustments to Cost	[1],[4]			1
Cash Payments	[1]			(27)
Others	[1],[5]			0
Accrued at period end	[1]			15	[2]	0
Fiscal 2017 Oracle Restructuring [Member]
Restructuring reserve [Line Items]
Restructuring expenses						601
Completion or expected completion date		May 31, 2018
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2018 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			249		185
Initial Costs	[1],[3]					638
Adjustments to Cost	[1],[4]					(37)
Cash Payments	[1]					(534)
Others	[1],[5]					(3)
Accrued at period end	[1]					249
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2018 Activity [Member] | Other [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			90		44
Initial Costs	[1],[3]					267
Adjustments to Cost	[1],[4]					(6)
Cash Payments	[1]					(208)
Others	[1],[5]					(7)
Accrued at period end	[1]					90
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2018 Activity [Member] | Cloud and License [Member] | Operating Segments [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			82		85
Initial Costs	[1],[3]					156
Adjustments to Cost	[1],[4]					(12)
Cash Payments	[1]					(150)
Others	[1],[5]					3
Accrued at period end	[1]					82
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2018 Activity [Member] | Hardware [Member] | Operating Segments [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			61		31
Initial Costs	[1],[3]					167
Adjustments to Cost	[1],[4]					(15)
Cash Payments	[1]					(122)
Others	[1],[5]					0
Accrued at period end	[1]					61
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2018 Activity [Member] | Services [Member] | Operating Segments [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			16		25
Initial Costs	[1],[3]					48
Adjustments to Cost	[1],[4]					(4)
Cash Payments	[1]					(54)
Others	[1],[5]					1
Accrued at period end	[1]					16
Other Restructuring Plans [Member] | Fiscal 2020 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2],[7]	$ 49
Initial Costs	[1],[3],[7]	0
Adjustments to Cost	[1],[4],[7]	(11)
Cash Payments	[1],[7]	(8)
Others	[1],[5],[7]	(17)
Accrued at period end	[1],[2],[7]	13		49
Other Restructuring Plans [Member] | Fiscal 2019 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[7]	$ 49	[2]	282
Initial Costs	[1],[3],[7]			5
Adjustments to Cost	[1],[4],[7]			(58)
Cash Payments	[1],[7]			(181)
Others	[1],[5],[7]			1
Accrued at period end	[1],[7]			49	[2]	282
Other Restructuring Plans [Member] | Fiscal 2018 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[6]			$ 33		79
Initial Costs	[1],[3],[6]					1
Adjustments to Cost	[1],[4],[6]					(14)
Cash Payments	[1],[6]					(37)
Others	[1],[5],[6]					4
Accrued at period end	[1],[6]					$ 33

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

[2] The balances at May 31, 2020 and 2019 included $150 million and $239 million, respectively, recorded in other current liabilities and $1 million and $23 million, respectively, recorded in other non-current liabilities.

[3] Costs recorded for the respective restructuring plans during the current periods 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 including those related to our adoption of Topic 842 as of June 1, 2019.

[6] Represents employee related severance costs for functions that are not included within our operating segments and certain other restructuring costs.

[7] Other restructuring plans presented in the tables above included condensed information for certain 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 periods presented but for which the periodic impact to our condensed consolidated statements of operations was not significant.