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BASIS OF PRESENTATION AND RECENT ACCOUNTING PRONOUNCEMENTS Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
Jun. 01, 2016
May 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Increase in net cash provided by operating activities     $ 6,961 $ 6,397    
Reduction to retained earnings $ (24,375)   (24,375)     $ (23,888)
Acquisition Related and Other Expenses [Abstract]            
Acquisition related benefit   $ 19   19    
Sales of Financing Receivables [Narrative] [Abstract]            
Sales of financing receivables $ 121 $ 228 $ 1,000 1,200    
ASU 2016-09 [Member]            
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Increase in net cash provided by operating activities       $ 40    
Increase to additional paid in capital         $ 9  
Increase to deferred tax assets         3  
Reduction to retained earnings         $ 6