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Impairment and onerous contracts - Other assets (Details)
R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Biopalma        
Disclosure of financial assets [line items]        
Gain from disposals of non-current assets   $ 125    
Carrying amount for CGU   0    
Other assets | Several segments        
Disclosure of financial assets [line items]        
Impairment loss   201 $ 119 $ 184
Midwest system        
Disclosure of financial assets [line items]        
Impairment loss | R$ R$ 0      
Onerous contracts provision   $ 240