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RESTRUCTURING ACTIVITIES (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Restructuring Reserve [Line Items]    
Accrued at Period Start [1] $ 120  
Initial Costs [2] 85  
Adjustments to Costs [3] (2)  
Cash Payments (64)  
Others [4] 2  
Accrued at Period End [1] 141  
Restructuring Expenses 83 $ 69
Fiscal 2015 Oracle Restructuring [Member]    
Restructuring Reserve [Line Items]    
Accrued at Period Start [5] 36  
Initial Costs [2],[5] 85  
Adjustments to Costs [3],[5] (2)  
Cash Payments [5] (55)  
Others [4],[5] 2  
Accrued at Period End [5] 66  
Total Costs Accrued to Date [5] 183  
Total Expected Program Costs [5] 626  
Restructuring Expenses 83  
Remaining Expenses to Incur $ 443  
Expected Completion Date or Completion Date May 31, 2016  
Fiscal 2015 Oracle Restructuring [Member] | Cloud software and on-premise software [Member]    
Restructuring Reserve [Line Items]    
Accrued at Period Start [5] $ 11  
Initial Costs [2],[5] 31  
Adjustments to Costs [3],[5] (1)  
Cash Payments [5] (21)  
Accrued at Period End [5] 20  
Total Costs Accrued to Date [5] 57  
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] 5  
Initial Costs [2],[5] 13  
Cash Payments [5] (8)  
Others [4],[5] 1  
Accrued at Period End [5] 11  
Total Costs Accrued to Date [5] 20  
Total Expected Program Costs [5] 209  
Fiscal 2015 Oracle Restructuring [Member] | Hardware business [Member]    
Restructuring Reserve [Line Items]    
Accrued at Period Start [5] 6  
Initial Costs [2],[5] 16  
Cash Payments [5] (10)  
Others [4],[5] 1  
Accrued at Period End [5] 13  
Total Costs Accrued to Date [5] 36  
Total Expected Program Costs [5] 65  
Fiscal 2015 Oracle Restructuring [Member] | Services business [Member]    
Restructuring Reserve [Line Items]    
Accrued at Period Start [5] 9  
Initial Costs [2],[5] 10  
Adjustments to Costs [3],[5] (1)  
Cash Payments [5] (9)  
Accrued at Period End [5] 9  
Total Costs Accrued to Date [5] 30  
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] 5  
Initial Costs [2],[5] 15  
Cash Payments [5] (7)  
Accrued at Period End [5] 13  
Total Costs Accrued to Date [5] 40  
Total Expected Program Costs [5] 141  
Other Restructuring Plans [Member]    
Restructuring Reserve [Line Items]    
Accrued at Period Start [6] 84  
Cash Payments [6] (9)  
Accrued at Period End [6] $ 75  
[1] The balances at August 31, 2015 and May 31, 2015 included $109 million and $86 million, respectively, recorded in other current liabilities, and $32 million and $34 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.
[6] 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 current impact to our consolidated statements of operations was not significant.