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Financial risk management: Liquidity position (Details) $ in Thousands, $ in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
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Dec. 30, 2020 | Sep. 11, 2020 | Jun. 29, 2020 | Apr. 23, 2020 MXN ($) | Apr. 01, 2020 USD ($) | Apr. 01, 2020 MXN ($) | Apr. 24, 2019 MXN ($) | Apr. 26, 2018 MXN ($) | Jun. 02, 2015 COP ($) | Jun. 02, 2015 MXN ($) | Oct. 31, 2017 MXN ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2021 MXN ($) | Dec. 31, 2020 COP ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Sep. 30, 2020 MXN ($) | Aug. 19, 2020 MXN ($) | Dec. 31, 2017 MXN ($)
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and equivalents |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,192,679 | $ 4,584,507 |  |  |  | $ 5,192,628 |  |  | $ 4,677,454
Total Debt |  |  |  |  |  |  |  |  |  |  |  |  | 13,712,893 |  |  | $ 440,000,000 |  | 13,900,346 |  |  |
Debt term short |  |  |  |  |  |  |  |  |  |  |  |  | 549,607 |  |  |  |  | 1,138,750 |  |  |
Debt term long |  |  |  |  |  |  |  |  |  |  |  |  | 13,163,286 |  |  |  |  | 12,761,596 |  |  |
Deferment investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,292,355 | $ 2,292,355 |
Dividends |  |  |  | $ 2,463,000 |  |  | $ 3,000,000 | $ 2,034,000 |  |  |  |  | 3,000,000 | 2,034,000 |  |  |  |  |  |  |
Disposal of loans |  |  |  |  |  |  |  |  | $ 440,000,000,000 | $ 2,897,404 |  | $ 243,998 | 152,047 | $ 3,090,124 |  |  |  |  |  |  |
Mexico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and equivalents |  |  |  |  |  |  |  |  |  |  |  |  | 4,991,567 |  |  |  |  | 4,058,495 |  |  |
Total Debt |  |  |  |  |  |  |  |  |  |  |  |  | 3,992,467 |  |  |  |  | 3,971,210 |  |  |
Debt term short |  |  |  |  |  |  |  |  |  |  |  |  | 23,998 |  |  |  |  | 322,209 |  |  |
Debt term long |  |  |  |  |  |  |  |  |  |  |  |  | 3,968,469 |  |  |  |  | 3,649,001 |  |  |
Deferment investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,292,355 |
Loans received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |
Puerto Rico (Aerostar) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and equivalents |  |  |  |  |  |  |  |  |  |  |  |  | 698,466 |  |  |  |  | 804,634 |  |  |
Total Debt |  |  |  |  |  |  |  |  |  |  |  |  | 6,799,941 |  |  |  |  | 7,171,278 |  |  |
Debt term short |  |  |  |  |  |  |  |  |  |  |  |  | 311,372 |  |  |  |  | 529,337 |  |  |
Debt term long |  |  |  |  |  |  |  |  |  |  |  |  | 6,488,569 |  |  |  |  | 6,641,941 |  |  |
Term of loan | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of loans |  |  |  |  | $ 10,000 | $ 239,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Colombia (Airplan) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and equivalents |  |  |  |  |  |  |  |  |  |  |  |  | 502,646 |  |  |  |  | 329,499 |  |  |
Total Debt |  |  |  |  |  |  |  |  |  |  |  |  | 2,920,485 |  |  |  |  | 2,757,858 |  |  |
Debt term short |  |  |  |  |  |  |  |  |  |  |  |  | 214,237 |  |  |  |  | 287,204 |  |  |
Debt term long |  |  |  |  |  |  |  |  |  |  |  |  | 2,706,248 |  |  |  |  | 2,470,654 |  |  |
Term of loan |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity risk [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and equivalents |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,192,679 |  |  |  |  | 5,192,628 |  |  |
Forecast | Mexico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferment investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,460,586 |  |  |  |  |  |
BBVA Bancomer, S. A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of loans |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |
BBVA Bancomer, S. A. | Liquidity risk [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |
Bancolombia | Liquidity risk [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 | $ 399,010 |  |  |
Banco Popular De Puerto Rico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of loan | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Banco Popular De Puerto Rico | Mexico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of loan |  |  | 18 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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