RESTRUCTURING ACTIVITIES (Details) - USD ($) $ in Millions		12 Months Ended
		May. 31, 2015		May. 31, 2014		May. 31, 2013
Restructuring reserve [Line Items]
Accrued at period start		$ 169	[1]	$ 250		$ 337
Initial Costs	[2]	238		221		403
Adjustments to Cost	[3]	(31)		(38)		(51)
Cash Payments		(244)		(253)		(426)
Others	[4]	(12)		(11)		(13)
Accrued at period end		120	[1]	169	[1]	250
Restructuring Expenses		207		183		352
Fiscal 2015 Oracle Restructuring [Member]
Restructuring reserve [Line Items]
Accrued at period start	[5]	0
Initial Costs	[2],[5]	103
Adjustments to Cost	[3],[5]	(3)
Cash Payments	[5]	(63)
Others	[4],[5]	(1)
Accrued at period end	[5]	36		0
Total Costs Accrued to Date	[5]	100
Total Expected Program Costs	[5]	626
Restructuring Expenses		100
Remaining Expenses to Incur		$ 526
Expected completion date		May 31, 2016
Fiscal 2015 Oracle Restructuring [Member] | New software licenses and cloud software subscriptions [Member]
Restructuring reserve [Line Items]
Accrued at period start	[5]	$ 0
Initial Costs	[2],[5]	26
Adjustments to Cost	[3],[5]	1
Cash Payments	[5]	(16)
Accrued at period end	[5]	11		0
Total Costs Accrued to Date	[5]	27
Total Expected Program Costs	[5]	110
Fiscal 2015 Oracle Restructuring [Member] | Software license updates and product support [Member]
Restructuring reserve [Line Items]
Accrued at period start	[5]	0
Initial Costs	[2],[5]	7
Cash Payments	[5]	(2)
Accrued at period end	[5]	5		0
Total Costs Accrued to Date	[5]	7
Total Expected Program Costs	[5]	209
Fiscal 2015 Oracle Restructuring [Member] | Hardware systems business [Member]
Restructuring reserve [Line Items]
Accrued at period start	[5]	0
Initial Costs	[2],[5]	22
Adjustments to Cost	[3],[5]	(2)
Cash Payments	[5]	(13)
Others	[4],[5]	(1)
Accrued at period end	[5]	6		0
Total Costs Accrued to Date	[5]	20
Total Expected Program Costs	[5]	65
Fiscal 2015 Oracle Restructuring [Member] | Services [Member]
Restructuring reserve [Line Items]
Accrued at period start	[5]	0
Initial Costs	[2],[5]	21
Cash Payments	[5]	(12)
Accrued at period end	[5]	9		0
Total Costs Accrued to Date	[5]	21
Total Expected Program Costs	[5]	101
Fiscal 2015 Oracle Restructuring [Member] | General and administrative and other [Member]
Restructuring reserve [Line Items]
Accrued at period start	[5]	0
Initial Costs	[2],[5]	27
Adjustments to Cost	[3],[5]	(2)
Cash Payments	[5]	(20)
Accrued at period end	[5]	5		0
Total Costs Accrued to Date	[5]	25
Total Expected Program Costs	[5]	141
Fiscal 2013 Oracle Restructuring [Member]
Restructuring reserve [Line Items]
Accrued at period start	[5]	61		71		0
Initial Costs	[2]	128	[6]	197	[5]	350	[5]
Adjustments to Cost	[3]	(9)	[6]	(23)	[5]	(25)	[5]
Cash Payments		(138)	[6]	(195)	[5]	(241)	[5]
Others	[4]	(11)	[6]	11	[5]	(13)	[5]
Accrued at period end		31	[6]	61	[5]	71	[5]
Restructuring Expenses		119		174		325
Fiscal 2013 Oracle Restructuring [Member] | New software licenses and cloud software subscriptions [Member]
Restructuring reserve [Line Items]
Accrued at period start	[5]	12		16		0
Initial Costs	[2],[5]			57		85
Adjustments to Cost	[3],[5]			(8)		(8)
Cash Payments	[5]			(55)		(60)
Others	[4],[5]			2		(1)
Accrued at period end	[5]			12		16
Fiscal 2013 Oracle Restructuring [Member] | Software license updates and product support [Member]
Restructuring reserve [Line Items]
Accrued at period start	[5]	5		1		0
Initial Costs	[2],[5]			11		13
Adjustments to Cost	[3],[5]					(6)
Cash Payments	[5]			(10)		(11)
Others	[4],[5]			3		5
Accrued at period end	[5]			5		1
Fiscal 2013 Oracle Restructuring [Member] | Hardware systems business [Member]
Restructuring reserve [Line Items]
Accrued at period start	[5]	18		24		0
Initial Costs	[2],[5]			48		99
Adjustments to Cost	[3],[5]			(3)		(5)
Cash Payments	[5]			(52)		(68)
Others	[4],[5]			1		(2)
Accrued at period end	[5]			18		24
Fiscal 2013 Oracle Restructuring [Member] | Services [Member]
Restructuring reserve [Line Items]
Accrued at period start	[5]	11		18		0
Initial Costs	[2],[5]			39		72
Adjustments to Cost	[3],[5]			(7)		(5)
Cash Payments	[5]			(39)		(50)
Others	[4],[5]					1
Accrued at period end	[5]			11		18
Fiscal 2013 Oracle Restructuring [Member] | General and administrative and other [Member]
Restructuring reserve [Line Items]
Accrued at period start	[5]	15		12		0
Initial Costs	[2],[5]			42		81
Adjustments to Cost	[3],[5]			(5)		(1)
Cash Payments	[5]			(39)		(52)
Others	[4],[5]			5		(16)
Accrued at period end	[5]			15		12
Other Restructuring Plans [Member]
Restructuring reserve [Line Items]
Accrued at period start	[6]	108		179		337
Initial Costs	[2],[6]	7		24		53
Adjustments to Cost	[3],[6]	(19)		(15)		(26)
Cash Payments	[6]	(43)		(58)		(185)
Others	[4],[6]			(22)
Accrued at period end	[6]	$ 53		$ 108		$ 179

[1] The balances at May 31, 2015 and 2014 included $86 million and $100 million, respectively, recorded in other current liabilities, and $34 million and $69 million, respectively, recorded in other non-current liabilities.

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

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

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

[5] Restructuring costs recorded for individual line items primarily related to employee severance costs except for general and administrative and other, which also included $46 million recorded during fiscal 2013 for facilities related restructuring, contract termination and other costs.

[6] Other restructuring plans presented in the tables 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 periods presented but for which the periodic impact to our consolidated statements of operations was not significant.