RESTRUCTURING ACTIVITIES (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2018		May 31, 2017		May 31, 2016
Restructuring reserve [Line Items]
Restructuring expenses		$ 588		$ 463		$ 458
Accrued at period start	[1]	264	[2]	283		120
Initial Costs	[1],[3]	639		508		484
Adjustments to Cost	[1],[4]	(51)		(45)		(26)
Cash Payments	[1]	(571)		(478)		(290)
Others	[1],[5]	1		(4)		(5)
Accrued at period end	[1]	282	[2]	264	[2]	283
Fiscal 2017 Oracle Restructuring [Member]
Restructuring reserve [Line Items]
Restructuring expenses		601		486
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2018 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2]	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],[2]	249		185
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2018 Activity [Member] | Cloud and license [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2]	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],[2]	82		85
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2018 Activity [Member] | Hardware [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2]	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],[2]	61		31
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2018 Activity [Member] | Services [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2]	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],[2]	16		25
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2018 Activity [Member] | Other [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2],[6]	44
Initial Costs	[1],[3],[6]	267
Adjustments to Cost	[1],[4],[6]	(6)
Cash Payments	[1],[6]	(208)
Others	[1],[5],[6]	(7)
Accrued at period end	[1],[2],[6]	90		44
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]	185	[2]	0
Initial Costs	[1],[3]			500
Adjustments to Cost	[1],[4]			(14)
Cash Payments	[1]			(309)
Others	[1],[5]			8
Accrued at period end	[1]			185	[2]	0
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member] | Cloud and license [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]	85	[2]	0
Initial Costs	[1],[3]			184
Adjustments to Cost	[1],[4]			(6)
Cash Payments	[1]			(100)
Others	[1],[5]			7
Accrued at period end	[1]			85	[2]	0
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member] | Hardware [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]	31	[2]	0
Initial Costs	[1],[3]			91
Adjustments to Cost	[1],[4]			(3)
Cash Payments	[1]			(57)
Others	[1],[5]			0
Accrued at period end	[1]			31	[2]	0
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member] | Services [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]	25	[2]	0
Initial Costs	[1],[3]			59
Adjustments to Cost	[1],[4]			(1)
Cash Payments	[1]			(34)
Others	[1],[5]			1
Accrued at period end	[1]			25	[2]	0
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member] | Other [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[6]	44	[2]	0
Initial Costs	[1],[3],[6]			166
Adjustments to Cost	[1],[4],[6]			(4)
Cash Payments	[1],[6]			(118)
Others	[1],[5],[6]			0
Accrued at period end	[1],[6]			$ 44	[2]	0
Fiscal 2015 Oracle Restructuring [Member]
Restructuring reserve [Line Items]
Restructuring expenses						462
Completion date				May 31, 2016
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2016 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			$ 238		36
Initial Costs	[1],[3]					482
Adjustments to Cost	[1],[4]					(20)
Cash Payments	[1]					(263)
Others	[1],[5]					3
Accrued at period end	[1]					238
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2016 Activity [Member] | Cloud and license [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			146		16
Initial Costs	[1],[3]					263
Adjustments to Cost	[1],[4]					(8)
Cash Payments	[1]					(129)
Others	[1],[5]					4
Accrued at period end	[1]					146
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2016 Activity [Member] | Hardware [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			23		6
Initial Costs	[1],[3]					67
Adjustments to Cost	[1],[4]					(8)
Cash Payments	[1]					(43)
Others	[1],[5]					1
Accrued at period end	[1]					23
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2016 Activity [Member] | Services [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			14		9
Initial Costs	[1],[3]					44
Adjustments to Cost	[1],[4]					(4)
Cash Payments	[1]					(35)
Others	[1],[5]					0
Accrued at period end	[1]					14
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2016 Activity [Member] | Other [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			55		5
Initial Costs	[1],[3]					108
Adjustments to Cost	[1],[4]					0
Cash Payments	[1]					(56)
Others	[1],[5]					(2)
Accrued at period end	[1]					55
Other Restructuring Plans [Member] | Fiscal 2018 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2],[7]	79
Initial Costs	[1],[3],[7]	1
Adjustments to Cost	[1],[4],[7]	(14)
Cash Payments	[1],[7]	(37)
Others	[1],[5],[7]	4
Accrued at period end	[1],[2],[7]	33		79
Other Restructuring Plans [Member] | Fiscal 2017 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[7]	$ 79	[2]	283
Initial Costs	[1],[3],[7]			8
Adjustments to Cost	[1],[4],[7]			(31)
Cash Payments	[1],[7]			(169)
Others	[1],[5],[7]			(12)
Accrued at period end	[1],[7]			79	[2]	283
Other Restructuring Plans [Member] | Fiscal 2016 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[6]			$ 45		84
Initial Costs	[1],[3],[6]					2
Adjustments to Cost	[1],[4],[6]					(6)
Cash Payments	[1],[6]					(27)
Others	[1],[5],[6]					(8)
Accrued at period end	[1],[6]					$ 45

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

[2] The balances at May 31, 2018 and 2017 included $257 million and $242 million, respectively, recorded in other current liabilities and $25 million and $22 million, respectively, recorded in other non-current liabilities.

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

[6] Represents employee related severance costs for functions that are not included within our operating segments and certain facilities related 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 consolidated statements of operations was not significant.