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Financial risk management: Exchange rate risk (Details) - MXN ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Financial risk management:    
Asset $ 70,342,424 $ 70,919,521
Liability (18,751,226) (21,903,914)
Exchange rate risk    
Financial risk management:    
Asset 507,164 372,991
Liability (6,419) (5,520)
Monetary active position $ 500,745 $ 367,471