RESTRUCTURING ACTIVITIES (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Restructuring reserve [Line Items]
Restructuring expenses		$ 43	$ 91	$ 275	$ 506
Accrued at period start	[1],[2]			282
Initial Costs	[1],[3]			305
Adjustments to Cost	[1],[4]			(45)
Cash Payments	[1]			(338)
Others	[1],[5]			3
Accrued at period end	[1],[2]	207		207
Fiscal 2019 Oracle Restructuring [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	432		432
Restructuring expenses				297
Remaining expenses to incur		135		$ 135
Expected completion date				May 31, 2020
Accrued at period start	[1],[2]			$ 0
Initial Costs	[1],[3]			300
Adjustments to Cost	[1],[4]			(3)
Cash Payments	[1]			(171)
Others	[1],[5]			1
Accrued at period end	[1],[2]	127		127
Total Costs Accrued to Date	[1]	297		297
Fiscal 2019 Oracle Restructuring [Member] | Other [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1],[6]	91		91
Accrued at period start	[1],[2],[6]			0
Initial Costs	[1],[3],[6]			80
Adjustments to Cost	[1],[4],[6]			(1)
Cash Payments	[1],[6]			(35)
Others	[1],[5],[6]			2
Accrued at period end	[1],[2],[6]	46		46
Total Costs Accrued to Date	[1],[6]	79		79
Fiscal 2019 Oracle Restructuring [Member] | Cloud and License [Member] | Operating Segments [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	230		230
Accrued at period start	[1],[2]			0
Initial Costs	[1],[3]			141
Adjustments to Cost	[1],[4]			(3)
Cash Payments	[1]			(86)
Others	[1],[5]			(1)
Accrued at period end	[1],[2]	51		51
Total Costs Accrued to Date	[1]	138		138
Fiscal 2019 Oracle Restructuring [Member] | Hardware [Member] | Operating Segments [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	66		66
Accrued at period start	[1],[2]			0
Initial Costs	[1],[3]			48
Adjustments to Cost	[1],[4]			0
Cash Payments	[1]			(29)
Others	[1],[5]			0
Accrued at period end	[1],[2]	19		19
Total Costs Accrued to Date	[1]	48		48
Fiscal 2019 Oracle Restructuring [Member] | Services [Member] | Operating Segments [Member]
Restructuring reserve [Line Items]
Total expected program costs	[1]	45		45
Accrued at period start	[1],[2]			0
Initial Costs	[1],[3]			31
Adjustments to Cost	[1],[4]			1
Cash Payments	[1]			(21)
Others	[1],[5]			0
Accrued at period end	[1],[2]	11		11
Total Costs Accrued to Date	[1]	32		32
Other Restructuring Plans [Member]
Restructuring reserve [Line Items]
Accrued at period start	[1],[2],[7]			282
Initial Costs	[1],[3],[7]			5
Adjustments to Cost	[1],[4],[7]			(42)
Cash Payments	[1],[7]			(167)
Others	[1],[5],[7]			2
Accrued at period end	[1],[2],[7]	$ 80		$ 80

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

[2] The balances at February 28, 2019 and May 31, 2018 included $183 million and $257 million, respectively, recorded in other current liabilities, and $24 million and $25 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] 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 table 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 period presented but for which the periodic impact to our condensed consolidated statements of operations was not significant.