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Equity - Share Repurchase Program (Details) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Oct. 31, 2023
Disclosure of classes of share capital [line items]            
Shares outstanding (in shares) 17,891,131,350       17,891,131,350  
Shares repurchased $ 20,308          
Capital Stock            
Disclosure of classes of share capital [line items]            
Shares outstanding (in shares) 17,380,124,735 17,380,124,735 17,650,487,035 17,827,507,880 17,889,224,850 17,891,131,350
Shares repurchased $ 86          
Treasury shares            
Disclosure of classes of share capital [line items]            
Shares outstanding (in shares) 0 270,362,300 177,020,845 61,716,970 1,906,500