RESTRUCTURING ACTIVITIES (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Restructuring reserve [Line Items]
Restructuring expenses		$ 86	$ 95	$ 185	$ 178
Accrued at period start	[1],[2]			283
Initial Costs	[1],[3]			206
Adjustments to Cost	[1],[4]			(21)
Cash Payments	[1]			(216)
Others	[1],[5]			(11)
Accrued at period end	[1],[2]	241		241
Fiscal 2017 Oracle Restructuring [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	502		502
Restructuring expenses				202
Remaining expenses to incur		300		$ 300
Expected completion date				May 31, 2018
Accrued at period start	[1],[2]			$ 0
Initial Costs	[1],[3]			205
Adjustments to Cost	[1],[4]			(3)
Cash Payments	[1]			(113)
Others	[1],[5]			(2)
Accrued at period end	[1],[2]	87		87
Total Costs Accrued to Date	[1]	202		202
Fiscal 2017 Oracle Restructuring [Member] | Cloud software and on-premise software [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	204		204
Accrued at period start	[1],[2]			0
Initial Costs	[1],[3]			70
Adjustments to Cost	[1],[4]			(2)
Cash Payments	[1]			(41)
Others	[1],[5]			(1)
Accrued at period end	[1],[2]	26		26
Total Costs Accrued to Date	[1]	68		68
Fiscal 2017 Oracle Restructuring [Member] | Software license updates and product support [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	41		41
Accrued at period start	[1],[2]			0
Initial Costs	[1],[3]			12
Adjustments to Cost	[1],[4]			0
Cash Payments	[1]			(9)
Others	[1],[5]			0
Accrued at period end	[1],[2]	3		3
Total Costs Accrued to Date	[1]	12		12
Fiscal 2017 Oracle Restructuring [Member] | Hardware business [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	111		111
Accrued at period start	[1],[2]			0
Initial Costs	[1],[3]			49
Adjustments to Cost	[1],[4]			(1)
Cash Payments	[1]			(23)
Others	[1],[5]			(1)
Accrued at period end	[1],[2]	24		24
Total Costs Accrued to Date	[1]	48		48
Fiscal 2017 Oracle Restructuring [Member] | Services business [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	63		63
Accrued at period start	[1],[2]			0
Initial Costs	[1],[3]			25
Adjustments to Cost	[1],[4]			0
Cash Payments	[1]			(14)
Others	[1],[5]			0
Accrued at period end	[1],[2]	11		11
Total Costs Accrued to Date	[1]	25		25
Fiscal 2017 Oracle Restructuring [Member] | General and administrative and other [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	83		83
Accrued at period start	[1],[2]			0
Initial Costs	[1],[3]			49
Adjustments to Cost	[1],[4]			0
Cash Payments	[1]			(26)
Others	[1],[5]			0
Accrued at period end	[1],[2]	23		23
Total Costs Accrued to Date	[1]	49		49
Other Restructuring Plans [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2],[6]			283
Initial Costs	[1],[3],[6]			1
Adjustments to Cost	[1],[4],[6]			(18)
Cash Payments	[1],[6]			(103)
Others	[1],[5],[6]			(9)
Accrued at period end	[1],[2],[6]	$ 154		$ 154

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

[2] The balances at November 30, 2016 and May 31, 2016 included $222 million and $255 million, respectively, recorded in other current liabilities, and $19 million and $28 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 (primarily the Fiscal 2015 Oracle Restructuring Plan) 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.