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Investments in associates and joint ventures - Guarantees provided (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Investments in associates and joint ventures |  |  |  |  |  |
Investments in associates and joint ventures | $ 2,197 | $ 2,071 | $ 2,197 | $ 2,071 | $ 2,031 | $ 2,798
Equity results in income statement | 105 | 43 | 77 | (67) |  |
Dividends received | 43 | 77 | 43 | 77 |  |
Ferrous minerals |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Investments in associates and joint ventures | 1,250 |  | 1,250 |  | 1,154 |
Equity results in income statement | 55 | 36 | 73 | 18 |  |
Dividends received | 22 | 53 | $ 22 | 53 |  |
Ferrous minerals | VLI S.A. |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 29.60% |  |  |
% Voting capital |  |  | 29.60% |  |  |
Investments in associates and joint ventures | 490 |  | $ 490 |  | 480 |
Equity results in income statement | 7 | 8 | $ (8) | (22) |  |
Ferrous minerals | Baovale Mineracao S.A |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.00% |  |  |
% Voting capital |  |  | 50.00% |  |  |
Investments in associates and joint ventures | 23 |  | $ 23 |  | 20 |
Equity results in income statement | 1 | 1 | $ 3 | 2 |  |
Ferrous minerals | Companhia Coreano-Brasileira de Pelotizacao |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.00% |  |  |
% Voting capital |  |  | 50.00% |  |  |
Investments in associates and joint ventures | 61 |  | $ 61 |  | 48 |
Equity results in income statement | 10 | 2 | 16 | 5 |  |
Dividends received | 2 | 17 | $ 2 | 17 |  |
Ferrous minerals | Companhia Hispano-Brasileira de Pelotizacao |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.89% |  |  |
% Voting capital |  |  | 50.89% |  |  |
Investments in associates and joint ventures | 41 |  | $ 41 |  | 43 |
Equity results in income statement |  |  |  | 3 |  |
Dividends received | 7 | 13 | $ 7 | 13 |  |
Ferrous minerals | Companhia Italo-Brasileira de Pelotizacao |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.90% |  |  |
% Voting capital |  |  | 51.00% |  |  |
Investments in associates and joint ventures | 58 |  | $ 58 |  | 44 |
Equity results in income statement | 9 | 5 | 13 | 10 |  |
Dividends received | 6 | 23 | $ 6 | 23 |  |
Ferrous minerals | Companhia Nipo-Brasileira de Pelotizacao |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 51.00% |  |  |
% Voting capital |  |  | 51.11% |  |  |
Investments in associates and joint ventures | 135 |  | $ 135 |  | 121 |
Equity results in income statement | 9 | 6 | 13 | 8 |  |
Dividends received | 7 |  | $ 7 |  |  |
Ferrous minerals | MRS Logistica S.A. |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 48.16% |  |  |
% Voting capital |  |  | 46.75% |  |  |
Investments in associates and joint ventures | 442 |  | $ 442 |  | 398 |
Equity results in income statement | 19 | 14 | $ 36 | 12 |  |
Ferrous minerals | Samarco Mineracao S.A. |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.00% |  |  |
% Voting capital |  |  | 50.00% |  |  |
Base metals |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Investments in associates and joint ventures | 17 |  | $ 17 |  | 18 |
Base metals | Korea Nickel Corp |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 25.00% |  |  |
% Voting capital |  |  | 25.00% |  |  |
Investments in associates and joint ventures | 17 |  | $ 17 |  | 18 |
Others |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Investments in associates and joint ventures | 930 |  | 930 |  | 859 |
Equity results in income statement | 50 | 7 | 4 | (85) |  |
Dividends received | 21 | 24 | $ 21 | 24 |  |
Others | Mineracao Rio Grande do Norte S.A. |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 40.00% |  |  |
% Voting capital |  |  | 40.00% |  |  |
Investments in associates and joint ventures | 70 |  | $ 70 |  | 71 |
Equity results in income statement | 7 | (2) | (3) | (12) |  |
Others | Others |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Investments in associates and joint ventures | 75 |  | 75 |  | 70 |
Equity results in income statement | (10) | (1) | $ (26) | (10) |  |
Others | Alianca Geracao de Energia S.A. |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 55.00% |  |  |
% Voting capital |  |  | 55.00% |  |  |
Investments in associates and joint ventures | 372 |  | $ 372 |  | 367 |
Equity results in income statement | 7 | 7 | 17 | 17 |  |
Dividends received | 21 | 24 | $ 21 | 24 |  |
Others | Alianca Norte Energia Participacoes S.A. |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 51.00% |  |  |
% Voting capital |  |  | 51.00% |  |  |
Investments in associates and joint ventures | 118 |  | $ 118 |  | 117 |
Equity results in income statement | (2) | (2) | $ (3) | (3) |  |
Others | California Steel Industries, Inc |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.00% |  |  |
% Voting capital |  |  | 50.00% |  |  |
Investments in associates and joint ventures | 295 |  | $ 295 |  | $ 234 |
Equity results in income statement | $ 48 | $ 5 | $ 61 | (2) |  |
Others | Companhia Siderurgica do Pecem |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.00% |  |  |
% Voting capital |  |  | 50.00% |  |  |
Equity results in income statement |  |  | $ (42) | $ (75) |  |

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