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Taxes - Deferred Tax Related to OCI (Details) - MXN ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of income taxes [Line Items]        
Deferred tax (liability)/asset, net $ 18,219 $ 20,227 $ 20,067 $ 14,691
Accumulated other comprehensive income        
Disclosure of income taxes [Line Items]        
Deferred tax (liability)/asset, net 1,839 3,332    
Accumulated other comprehensive income | Valuation of the effective portion of derivative financial instrument        
Disclosure of income taxes [Line Items]        
Deferred tax (liability)/asset, net 1,125 324    
Accumulated other comprehensive income | Remeasurements of the net defined benefit liability        
Disclosure of income taxes [Line Items]        
Deferred tax (liability)/asset, net (620) (221)    
Accumulated other comprehensive income | Exchange differences on translation of foreign operations        
Disclosure of income taxes [Line Items]        
Deferred tax (liability)/asset, net (67) 1,828    
Accumulated other comprehensive income | Gain on hedge of net investments in foreign operations        
Disclosure of income taxes [Line Items]        
Deferred tax (liability)/asset, net $ 1,401 $ 1,401