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Financial risk management and fair value estimates (Details) - Market Risk [Member]
$ in Millions, $ in Millions, $ in Millions
Jun. 30, 2018
USD ($)
Jun. 30, 2018
UYU ($)
Jun. 30, 2018
ARS ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
UYU ($)
Jun. 30, 2017
ARS ($)
Disclosure of risk management strategy related to hedge accounting [line items]            
Net monetary position (Liability)/Asset US     $ (13,692)     $ (11,567)
Net monetary position (Liability)/Asset NIS           1
Argentina, Pesos            
Disclosure of risk management strategy related to hedge accounting [line items]            
Net monetary position (Liability)/Asset US     $ (13,324)     (11,436)
Net monetary position (Liability)/Asset NIS          
UYU            
Disclosure of risk management strategy related to hedge accounting [line items]            
Net monetary position (Liability)/Asset US   $ (368)     $ (131)  
Net monetary position (Liability)/Asset NIS          
USD            
Disclosure of risk management strategy related to hedge accounting [line items]            
Net monetary position (Liability)/Asset US        
Net monetary position (Liability)/Asset NIS       $ 1