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Related parties - Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Related parties    
Loans to related parties $ 1,118 $ 1,919
Nacala Corridor    
Related parties    
Loans to related parties $ 798  
Interest rate 8.20%  
Vale Mocambique S.A.    
Related parties    
Interest rate 5.83%