RESTRUCTURING ACTIVITIES (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2017		May 31, 2016		May 31, 2015
Restructuring reserve [Line Items]
Restructuring expenses		$ 463		$ 458		$ 207
Accrued at period start	[1]	283	[2]	120		169
Initial Costs	[1],[3]	508		484		238
Adjustments to Cost	[1],[4]	(45)		(26)		(31)
Cash Payments	[1]	(478)		(290)		(244)
Others	[1],[5]	(4)		(5)		(12)
Accrued at period end	[1]	264	[2]	283	[2]	120
Fiscal 2017 Oracle Restructuring [Member]
Restructuring reserve [Line Items]
Total expected program costs		889
Restructuring expenses		486
Remaining expenses to incur		$ 403
Expected completion date		May 31, 2018
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	$ 889
Accrued at period start	[1],[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],[2]	185		0
Total Costs Accrued to Date	[1]	486
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member] | Cloud and on-premise software [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	295
Accrued at period start	[1],[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],[2]	85		0
Total Costs Accrued to Date	[1]	178
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member] | Hardware [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	230
Accrued at period start	[1],[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],[2]	31		0
Total Costs Accrued to Date	[1]	88
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member] | Services [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	92
Accrued at period start	[1],[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],[2]	25		0
Total Costs Accrued to Date	[1]	58
Fiscal 2017 Oracle Restructuring [Member] | Fiscal 2017 Activity [Member] | Other [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	272
Accrued at period start	[1],[2]	0
Initial Costs	[1],[3]	166
Adjustments to Cost	[1],[4]	(4)
Cash Payments	[1]	(118)
Others	[1],[5]	0
Accrued at period end	[1],[2]	44		0
Total Costs Accrued to Date	[1]	$ 162
Fiscal 2015 Oracle Restructuring [Member]
Restructuring reserve [Line Items]
Restructuring expenses				462		100
Expected completion date		May 31, 2016
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2016 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]	$ 238	[2]	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	[2]	36
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2016 Activity [Member] | Cloud and on-premise software [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]	146	[2]	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	[2]	16
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2016 Activity [Member] | Hardware [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]	23	[2]	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	[2]	6
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2016 Activity [Member] | Services [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]	14	[2]	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	[2]	9
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2016 Activity [Member] | Other [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]	55	[2]	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	[2]	5
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2015 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			36		0
Initial Costs	[1],[3]					103
Adjustments to Cost	[1],[4]					(3)
Cash Payments	[1]					(63)
Others	[1],[5]					(1)
Accrued at period end	[1]					36
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2015 Activity [Member] | Cloud and on-premise software [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			16		0
Initial Costs	[1],[3]					33
Adjustments to Cost	[1],[4]					1
Cash Payments	[1]					(18)
Others	[1],[5]					0
Accrued at period end	[1]					16
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2015 Activity [Member] | Hardware [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			6		0
Initial Costs	[1],[3]					22
Adjustments to Cost	[1],[4]					(2)
Cash Payments	[1]					(13)
Others	[1],[5]					(1)
Accrued at period end	[1]					6
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2015 Activity [Member] | Services [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			9		0
Initial Costs	[1],[3]					21
Adjustments to Cost	[1],[4]					0
Cash Payments	[1]					(12)
Others	[1],[5]					0
Accrued at period end	[1]					9
Fiscal 2015 Oracle Restructuring [Member] | Fiscal 2015 Activity [Member] | Other [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1]			5		0
Initial Costs	[1],[3]					27
Adjustments to Cost	[1],[4]					(2)
Cash Payments	[1]					(20)
Others	[1],[5]					0
Accrued at period end	[1]					5
Other Restructuring Plans [Member] | Fiscal 2017 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2],[6]	283
Initial Costs	[1],[3],[6]	8
Adjustments to Cost	[1],[4],[6]	(31)
Cash Payments	[1],[6]	(169)
Others	[1],[5],[6]	(12)
Accrued at period end	[1],[2],[6]	79		283
Other Restructuring Plans [Member] | Fiscal 2016 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[6]	$ 45	[2]	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	[2]	84
Other Restructuring Plans [Member] | Fiscal 2015 Activity [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[6]			$ 84		169
Initial Costs	[1],[3],[6]					135
Adjustments to Cost	[1],[4],[6]					(28)
Cash Payments	[1],[6]					(181)
Others	[1],[5],[6]					(11)
Accrued at period end	[1],[6]					$ 84

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

[2] The balances at May 31, 2017 and 2016 included $242 million and $255 million, respectively, recorded in other current liabilities and $22 million and $28 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] 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.