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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

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