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Contingencies (Details)
€ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2015
USD ($)
Nov. 30, 2015
USD ($)
Nov. 30, 2015
EUR (€)
Independent Contractor California [Member]      
Loss Contingency [Line Items]      
Litigation Settlement Amount   $ 228  
Independent Contractor All [Member]      
Loss Contingency [Line Items]      
Litigation Settlement Expense $ 41    
Independent Contractor Other States [Member]      
Loss Contingency [Line Items]      
Litigation Settlement Amount   47  
TATEX Euro [Member]      
Loss Contingency [Line Items]      
Loss Contingency Damages Awarded Value | €     € 17
TATEX USD [Member]      
Loss Contingency [Line Items]      
Loss Contingency Damages Awarded Value   19  
U.S. CBP estimated uncollected amount Minimum [Member]      
Loss Contingency [Line Items]      
Loss Contingency Damages Sought Value   76  
U.S. CBP estimated uncollected amount Maximum [Member]      
Loss Contingency [Line Items]      
Loss Contingency Damages Sought Value   $ 210