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Financial risk management: Exchange rate risk (Details) - MXN ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financial risk management:    
Asset $ 65,830,728 $ 60,411,211
Liability (20,060,672) (18,718,005)
Exchange rate risk    
Financial risk management:    
Asset 124,656 88,426
Liability (7,580) (5,578)
Net Monetary Assets $ 117,076 $ 82,848