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Financial risk management: Exchange rate risk (Details) - MXN ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Financial risk management:    
Asset $ 70,919,521 $ 65,830,728
Liability (21,903,914) (20,060,672)
Exchange rate risk    
Financial risk management:    
Asset 372,991 124,656
Liability (5,520) (7,580)
Net Monetary Assets $ 367,471 $ 117,076