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Financial assets and liabilities - Loans and financing (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | $ 13,862 | $ 15,027
Debt contracts in Brazil |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 960 | 1,470
Debt contracts in the international markets |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 11,194 | 11,890
Carrying amount |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 11,998 | 13,159
Carrying amount | Quoted in the secondary market | Bonds |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 7,448 | 7,448
Carrying amount | Quoted in the secondary market | Eurobonds |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing |  | 920
Carrying amount | Quoted in the secondary market | Debentures |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 428 | 496
Carrying amount | Debt contracts in Brazil | TJLP, TR, IPCA, IGP-M and CDI | R$ |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 460 | 860
Carrying amount | Debt contracts in Brazil | Fixed interest | R$ |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 25 | 34
Carrying amount | Debt contracts in Brazil | LIBOR | US$ |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 33 | 56
Carrying amount | Debt contracts in the international markets | Fixed interest | US$ |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 3,398 | 3,225
Carrying amount | Debt contracts in the international markets | Fixed interest | Other currencies |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 110 | 120
Carrying amount | Debt contracts in the international markets | LIBOR | Other currencies |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 96 |
Fair value |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 14,090 | 15,866
Fair value | Quoted in the secondary market | Bonds |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 9,277 | 10,025
Fair value | Quoted in the secondary market | Eurobonds |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing |  | 985
Fair value | Quoted in the secondary market | Debentures |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 435 | 496
Fair value | Debt contracts in Brazil | TJLP, TR, IPCA, IGP-M and CDI | R$ |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 679 | 857
Fair value | Debt contracts in Brazil | Fixed interest | R$ |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 25 | 35
Fair value | Debt contracts in Brazil | LIBOR | US$ |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 54 | 56
Fair value | Debt contracts in the international markets | Fixed interest | US$ |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 3,401 | 3,278
Fair value | Debt contracts in the international markets | Fixed interest | Other currencies |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | 123 | $ 134
Fair value | Debt contracts in the international markets | LIBOR | Other currencies |  |
Disclosure of detailed information about borrowings [line items] |  |
Loans and financing | $ 96 |

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