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ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Millions
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Acquisition Related and Other Expenses [Abstract]      
Transitional and other employee related costs $ 57 $ 27 $ 27
Stock-based compensation 5 10 33
Professional fees and other, net (35) 20 (276)
Business combination adjustments, net 184 (16) (388)
Total acquisition related and other expenses 211 41 (604)
Goodwill impairment loss [1] 186    
Benefit related to certain litigation 53   306
Change in fair value of contingent consideration payable     387
Advertising [Abstract]      
Advertising expenses 55 79 85
Basis of Financial Statements [Abstract]      
Goodwill impairment loss [1] 186    
Benefit related to certain litigation 53   306
Change in fair value of contingent consideration payable     387
Foreign Currency [Abstract]      
Net foreign exchange transaction losses included in non-operating income (expense), net 157 375 162
Goodwill, Intangible Assets and Impairment Assessments [Abstract]      
Goodwill impairment loss [1] 186    
Impairment of intangible assets 0 0 0
Non-Operating Income (Expense), net [Abstract]      
Interest income 349 263 237
Foreign currency losses, net (157) (375) (162)
Noncontrolling interests in income (113) (98) (112)
Other income, net 27 69 48
Total non-operating income (expense), net 106 (141) 11
Foreign currency remeasurement loss resulting from the devaluation of the Venezuelan currency 23 213 64
Other Receivables [Narrative] [Abstract]      
Other receivables included in prepaid expenses and other current assets 817 906  
Sales of Financing Receivables [Narrative] [Abstract]      
Sales of financing receivables $ 1,800 $ 2,000 $ 2,200
[1] During fiscal 2015, we recorded a $186 million goodwill impairment loss to our hardware systems products reporting unit. We considered several approaches to determine the fair value of our hardware systems reporting unit as of March 1, 2015 and concluded the most appropriate to be the income approach. The fair value of our hardware systems products reporting unit pursuant to the income approach was impacted by lower forecasted operating results for this reporting unit, primarily caused by lower forecasted revenues and our continued investment in hardware products research and development activities. We compared the implied fair value of goodwill in our hardware systems products reporting unit to its carrying value, which resulted in the $186 million goodwill impairment loss and represented the aggregate amount of goodwill for our hardware systems products reporting unit. Such impairment loss was recorded to acquisition related and other expenses in our fiscal 2015 consolidated statement of operations. We did not recognize any goodwill impairment losses in fiscal 2014 or 2013.