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Contingencies (Details)
€ in Millions, $ in Millions
9 Months Ended 12 Months Ended
Feb. 29, 2016
USD ($)
Feb. 29, 2016
EUR (€)
May. 31, 2015
USD ($)
Independent Contractor California [Member]      
Loss Contingency [Line Items]      
Litigation Settlement Amount     $ 228
TATEX [Member]      
Loss Contingency [Line Items]      
Loss Contingency Damages Awarded Value $ 19 € 17  
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    
U.S. CBP [Member]      
Loss Contingency [Line Items]      
Offer of Compromise (net of insurance recovery) 69    
Multidistrict Independent Contractor Litigation [Member]      
Loss Contingency [Line Items]      
Litigation Settlement Amount $ 204