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Financial assets and liabilities -Loans and financing (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Loans and financing $ 13,360 $ 13,056
Debt contracts in Brazil    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 1,470 2,562
Debt contracts in the international markets    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 11,890 10,494
Carrying amount    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 13,159 12,845
Carrying amount | US$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 3,225 3,194
Carrying amount | EUR    
Disclosure of detailed information about borrowings [line items]    
Loans and financing   224
Carrying amount | Other currencies    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 120 120
Carrying amount | TJLP, TR, IPCA, IGP-M and CDI    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 860 1,332
Carrying amount | Fixed interest    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 34 88
Carrying amount | Basket of currencies and bonds in US$ indexed to LIBOR    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 56 101
Carrying amount | Bonds    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 7,448 5,948
Carrying amount | Eurobonds    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 920 843
Carrying amount | Debentures    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 496 995
Fair value    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 15,866 14,584
Fair value | US$    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 3,278 3,280
Fair value | EUR    
Disclosure of detailed information about borrowings [line items]    
Loans and financing   211
Fair value | Other currencies    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 134 131
Fair value | TJLP, TR, IPCA, IGP-M and CDI    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 857 1,379
Fair value | Fixed interest    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 35 88
Fair value | Basket of currencies and bonds in US$ indexed to LIBOR    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 56 100
Fair value | Bonds    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 10,025 7,484
Fair value | Eurobonds    
Disclosure of detailed information about borrowings [line items]    
Loans and financing 985 916
Fair value | Debentures    
Disclosure of detailed information about borrowings [line items]    
Loans and financing $ 496 $ 995