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Income tax - Analysis of income tax expense (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Income tax        
Current year income tax expense   $ (347,803) $ (90,609) $ (281,491)
Deferred income tax (expense) benefit   (246,125) 1,496,793 (813,340)
Total income tax benefit (expense) $ (28,855) (593,928) 1,406,184 (1,094,831)
Deferred income tax expense, translation effect   (2,015) 2,035 (2,278)
Deferred income tax related to items recognized in OCI during the year        
Net (loss) gain cash flow hedges   (5,655) 46,835 (74,820)
Remeasurement gain of employee benefits   2,850 794 3,058
Deferred income tax recognized in OCI   $ (2,805) $ 47,629 $ (71,762)