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Income taxes (Narrative) (Details) R$ in Thousands, $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2020 BRL (R$) | Dec. 31, 2019 MXN ($) | Dec. 31, 2019 BRL (R$) | Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Effective tax rate | 31.24% | 31.24% | 31.24% | 58.21% | 58.21% | 17.92%
Amount of tax payments and expenses increase (decrease) |  | $ 554,400 |  | $ 2,323,700 |  |
GV do Brasil Industria e Comercio of Aco LTDA [Member] |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Tax losses |  | 985,000 |  | $ 1,025,000 |  |
Companhia Siderurgica do Espirito Santo S.A. [Member] |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Tax losses |  | $ 94 |  |  |  |
USD [Member] |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Tax losses | $ 7,832,647 |  |  |  |  |
Brazil, Brazil Real [Member] | GV do Brasil Industria e Comercio of Aco LTDA [Member] |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Tax losses | R$ |  |  | R$ 203,346 |  | R$ 210,525 |
Brazil, Brazil Real [Member] | Companhia Siderurgica do Espirito Santo S.A. [Member] |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Tax losses | R$ |  |  | R$ 6,082 |  |  |
Mexican companies [Member] |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Effective tax rate | 30.00% | 30.00% | 30.00% | 30.00% | 30.00% |
Amount of tax payments and expenses increase (decrease) |  | $ 554,435 |  | $ 2,323,662 |  |
Republic [Member] | USD [Member] |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Tax losses | $ 281,000 |  |  |  |  |
Expiration period | expire between 2033 and 2038 | expire between 2033 and 2038 | expire between 2033 and 2038 |  |  |
Defined [Member] | USD [Member] |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Tax losses | $ 200,300 |  |  |  |  |
Expiration period | expire between 2033 and 2038 | expire between 2033 and 2038 | expire between 2033 and 2038 |  |  |
Undefined [Member] | USD [Member] |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Tax losses | $ 80,700 |  |  |  |  |
State and local [Member] | USD [Member] |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Tax losses | $ 313,600 |  |  |  |  |
Expiration period | expire between 2021 and 2040 | expire between 2021 and 2040 | expire between 2021 and 2040 |  |  |
Canada [Member] | USD [Member] |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |
Tax losses | $ 6,100 |  |  |  |  |
Expiration period | expire between 2032 and 2040 | expire between 2032 and 2040 | expire between 2032 and 2040 |  |  |

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