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Financial Instruments - Cross Currency Swaps (Details) - MXN ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Face amount $ 67,216 $ 52,369
Year one    
Disclosure of detailed information about financial instruments [line items]    
Face amount 0  
Year two    
Disclosure of detailed information about financial instruments [line items]    
Face amount 6,251  
Year three    
Disclosure of detailed information about financial instruments [line items]    
Face amount 4,358  
Year four    
Disclosure of detailed information about financial instruments [line items]    
Face amount 6,819  
Year five    
Disclosure of detailed information about financial instruments [line items]    
Face amount 0  
Currency swap contract | Year one    
Disclosure of detailed information about financial instruments [line items]    
Face amount 4,483 954
Fair value Liability 0 35
Fair Value Asset 679 103
Currency swap contract | Year two    
Disclosure of detailed information about financial instruments [line items]    
Face amount 7,243 49,834
Fair value Liability 1 2
Fair Value Asset 547 119
Currency swap contract | Year three    
Disclosure of detailed information about financial instruments [line items]    
Face amount 19,300 6,045
Fair value Liability 137 1,017
Fair Value Asset 836 98
Currency swap contract | Year four    
Disclosure of detailed information about financial instruments [line items]    
Face amount 6,819 8,949
Fair value Liability (211) (1,391)
Fair Value Asset 0 9
Currency swap contract | Year five    
Disclosure of detailed information about financial instruments [line items]    
Face amount 2,182 6,009
Fair value Liability 0 0
Fair Value Asset 615 89
Currency swap contract | Six years and not later than then years    
Disclosure of detailed information about financial instruments [line items]    
Face amount   20
Fair value Liability   0
Fair Value Asset   337
Currency swap contract | 2030    
Disclosure of detailed information about financial instruments [line items]    
Face amount 26,086 13,633
Fair value Liability 68 803
Fair Value Asset 3,166 0
Currency swap contract | 2032    
Disclosure of detailed information about financial instruments [line items]    
Face amount   845
Fair value Liability   (51)
Fair Value Asset   0
Currency swap contract | 2033    
Disclosure of detailed information about financial instruments [line items]    
Face amount 10,000 4,931
Fair value Liability (2,248) 0
Fair Value Asset 0 117
Currency swap contract | 2035    
Disclosure of detailed information about financial instruments [line items]    
Face amount 12,492 10,000
Fair value Liability 0 3,809
Fair Value Asset $ 3,588 0
Currency swap contract | 2043    
Disclosure of detailed information about financial instruments [line items]    
Face amount   5,398
Fair value Liability   0
Fair Value Asset   1,877
Currency swap contract | 2050    
Disclosure of detailed information about financial instruments [line items]    
Face amount   3,471
Fair value Liability   0
Fair Value Asset   $ 1,235