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Financial risk management and fair value estimates (Details 2)
$ in Millions
Jun. 30, 2020
ARS ($)
Tonne
Jun. 30, 2019
ARS ($)
Tonne
Disclosure of financial assets [line items]    
Derivatives at fair value $ 16 $ 44
Agricultural Business [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 573,902 848,590
Margin $ 196 $ 257
Premium paid or (collected) (8) (6)
Derivatives at fair value (8) (134)
Gain / (Loss) for valuation at fair value at year-end $ 229 $ 75
Agricultural Business [Member] | Futures Contract [Member] | Sale Futures [Member] | Corn [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 152,531 123,905
Margin $ 70 $ 35
Premium paid or (collected)
Derivatives at fair value (23) (40)
Gain / (Loss) for valuation at fair value at year-end $ 7 $ (47)
Agricultural Business [Member] | Futures Contract [Member] | Sale Futures [Member] | Soybeans [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 86,421 184,592
Margin $ 60 $ 129
Premium paid or (collected)
Derivatives at fair value (23) (51)
Gain / (Loss) for valuation at fair value at year-end $ 227 $ (29)
Agricultural Business [Member] | Futures Contract [Member] | Sale Futures [Member] | Wheat [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 86,421 26,200
Margin $ 10 $ 9
Premium paid or (collected)
Derivatives at fair value 3
Gain / (Loss) for valuation at fair value at year-end
Agricultural Business [Member] | Futures Contract [Member] | Sale Futures [Member] | Ethanol [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 600 1,500
Margin
Premium paid or (collected)
Derivatives at fair value
Gain / (Loss) for valuation at fair value at year-end $ (8) $ 5
Agricultural Business [Member] | Futures Contract [Member] | Purchase futures [Member] | Corn [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 46,480 86,262
Margin $ (21) $ (2)
Premium paid or (collected)
Derivatives at fair value 8 4
Gain / (Loss) for valuation at fair value at year-end $ 4
Agricultural Business [Member] | Futures Contract [Member] | Purchase futures [Member] | Soybeans [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 16,665 61,284
Margin $ 22 $ (21)
Premium paid or (collected)
Derivatives at fair value 5 6
Gain / (Loss) for valuation at fair value at year-end $ 6
Agricultural Business [Member] | Futures Contract [Member] | Purchase futures [Member] | Wheat [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 17,700 4,100
Margin $ (3) $ (1)
Premium paid or (collected)
Derivatives at fair value 1 (1)
Gain / (Loss) for valuation at fair value at year-end $ (1)
Agricultural Business [Member] | Futures Contract [Member] | Sale Futures [Member] | Livestock [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 54,450 6,930
Margin
Premium paid or (collected)
Derivatives at fair value
Gain / (Loss) for valuation at fair value at year-end $ (9)
Agricultural Business [Member] | Futures Contract [Member] | Sale Futures [Member] | Cotton [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 893 423
Margin
Premium paid or (collected)
Derivatives at fair value 13 4
Gain / (Loss) for valuation at fair value at year-end
Agricultural Business [Member] | Option contract [member] | Sale Put Options [Member] | Corn [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 40,265 25,949
Margin
Premium paid or (collected)
Derivatives at fair value (23) (21)
Gain / (Loss) for valuation at fair value at year-end $ (24) $ (9)
Agricultural Business [Member] | Option contract [member] | Sale Put Options [Member] | Soybeans [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 35,572 54,407
Margin
Premium paid or (collected)
Derivatives at fair value (5) (66)
Gain / (Loss) for valuation at fair value at year-end $ 47 106
Agricultural Business [Member] | Option contract [member] | Sale Put Options [Member] | Wheat [Member]    
Disclosure of financial assets [line items]    
Margin  
Premium paid or (collected)   1
Derivatives at fair value  
Gain / (Loss) for valuation at fair value at year-end   $ (1)
Agricultural Business [Member] | Option contract [member] | Sale Put Options [Member] | Livestock [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 16,500
Margin
Premium paid or (collected)
Derivatives at fair value (1)
Gain / (Loss) for valuation at fair value at year-end $ (1)
Agricultural Business [Member] | Option contract [member] | Sale Put Options [Member] | Cotton [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 625 1,473
Margin
Premium paid or (collected)
Derivatives at fair value (5) (1)
Gain / (Loss) for valuation at fair value at year-end
Agricultural Business [Member] | Option contract [member] | Purchase Put Option [Member] | Corn [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne  
Margin
Premium paid or (collected) (1)
Derivatives at fair value (7)
Gain / (Loss) for valuation at fair value at year-end 1
Agricultural Business [Member] | Option contract [member] | Purchase Put Option [Member] | Soybeans [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 1,000  
Margin  
Premium paid or (collected)  
Derivatives at fair value (5)  
Gain / (Loss) for valuation at fair value at year-end  
Agricultural Business [Member] | Option contract [member] | Purchase Put Option [Member] | Wheat [Member]    
Disclosure of financial assets [line items]    
Margin  
Premium paid or (collected)   (1)
Derivatives at fair value  
Gain / (Loss) for valuation at fair value at year-end   $ 1
Agricultural Business [Member] | Option contract [member] | Sale Call Options [Member] | Corn [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 89,700 108,900
Margin $ 52 $ 54
Premium paid or (collected) (5) 6
Derivatives at fair value 31 14
Gain / (Loss) for valuation at fair value at year-end $ 4
Agricultural Business [Member] | Option contract [member] | Sale Call Options [Member] | Soybeans [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 89,700 131,765
Margin $ 2 $ 52
Premium paid or (collected) (17) (1)
Derivatives at fair value 28 24
Gain / (Loss) for valuation at fair value at year-end $ 26
Agricultural Business [Member] | Option contract [member] | Sale Call Options [Member] | Wheat [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne 8,000 14,400
Margin $ 4 $ 2
Premium paid or (collected) (1)
Derivatives at fair value 3 4
Gain / (Loss) for valuation at fair value at year-end 6
Agricultural Business [Member] | Option contract [member] | Purchased Call Options [Member] | Corn [Member]    
Disclosure of financial assets [line items]    
Margin  
Premium paid or (collected)   (1)
Derivatives at fair value   (9)
Gain / (Loss) for valuation at fair value at year-end   3
Agricultural Business [Member] | Option contract [member] | Purchased Call Options [Member] | Soybeans [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne  
Margin
Premium paid or (collected) 9 (8)
Derivatives at fair value (4)
Gain / (Loss) for valuation at fair value at year-end
Agricultural Business [Member] | Option contract [member] | Purchased Call Options [Member] | Wheat [Member]    
Disclosure of financial assets [line items]    
Commodities (in tons) | Tonne  
Margin  
Premium paid or (collected) 5  
Derivatives at fair value (5)  
Gain / (Loss) for valuation at fair value at year-end