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Business Combinations - Additional Information (Details)
€ in Millions, £ in Millions, $ in Millions
12 Months Ended
May 31, 2016
USD ($)
May 31, 2018
USD ($)
Country
Mar. 23, 2018
USD ($)
Mar. 23, 2018
GBP (£)
Oct. 13, 2017
USD ($)
May 31, 2017
USD ($)
May 25, 2016
USD ($)
May 25, 2016
EUR (€)
Business Acquisition [Line Items]                
Goodwill $ 6,747 $ 6,973       $ 7,154    
TNT acquisition related costs 115              
TNT restructuring, impairments, litigation matters and pension adjustments 40              
TNT acquisition [Member]                
Business Acquisition [Line Items]                
Acquisition price           4,894 $ 4,900 € 4,400
Cash acquired             $ 280 € 250
Number of country for collection, transports and delivery of documents, parcels and freight | Country   200            
Goodwill           $ 3,452    
Net increase in goodwill $ 488              
P2P Mailing Limited [Member]                
Business Acquisition [Line Items]                
Acquisition price     $ 135 £ 92        
Northwest Research, Inc. [Member]                
Business Acquisition [Line Items]                
Acquisition price         $ 50