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Financial Instruments - Hedging Reserve Rollforward (Details) - MXN ($)
$ in Millions
 1 Months Ended 12 Months Ended
Oct. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about hedged items [line items]        
The amounts included in non-financial costs:   $ 801 $ (355) $ (1,158)
IFS TopCo LLC        
Disclosure of detailed information about hedged items [line items]        
Economic ownership percentage 37.10% 37.10% 37.10%  
Reserve of cash flow hedges        
Disclosure of detailed information about hedged items [line items]        
Balances at beginning of the period   $ 956    
Balances at the end of the period   3,121 $ 956  
Reserve of cash flow hedges | Foreign exchange currency risk | Purchase of stock        
Disclosure of detailed information about hedged items [line items]        
Valuation of the effective portion of derivative financial instruments   844    
The amounts included in non-financial costs:   (98)    
Reserve of cash flow hedges | Foreign exchange currency risk | Other stock        
Disclosure of detailed information about hedged items [line items]        
Valuation of the effective portion of derivative financial instruments   1,436    
Amounts reclassified to profit an loss   4,708    
Reserve of cash flow hedges | Interest rate risk        
Disclosure of detailed information about hedged items [line items]        
Valuation of the effective portion of derivative financial instruments   (64)    
Amounts reclassified to profit an loss   (45)    
The amounts included in non-financial costs:   133    
Reserve of cash flow hedges | Commodity price risk | Purchase of stock        
Disclosure of detailed information about hedged items [line items]        
Valuation of the effective portion of derivative financial instruments   (4,747)    
The amounts included in non-financial costs:   $ (2)