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Financial Instruments - Interest Rate Swaps (Details) - MXN ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount $ 67,216 $ 52,369
Year one    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount 0  
Year two    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount 6,251  
Year three    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount 4,358  
Year four    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount 6,819  
Year five    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount 0  
Six years and thereafter    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount 49,788  
Interest rate swaps | Year one    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount   2
Fair value Liability   0
Fair Value Asset   65
Interest rate swaps | Year three    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount 2,339  
Fair value Liability 0  
Fair Value Asset 1  
Interest rate swaps | Six years and thereafter    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount 10,134 8,447
Fair value Liability 1,784 1,381
Fair Value Asset 0 0
Currency swap contract | Year one    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount 4,483 954
Fair value Liability 0 35
Fair Value Asset 679 103
Currency swap contract | Year two    
Disclosure of Financial Assets and Financial Liabilities [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 Financial Assets and Financial Liabilities [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 Financial Assets and Financial Liabilities [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 Financial Assets and Financial Liabilities [Line Items]    
Face amount 2,182 6,009
Fair value Liability 0 0
Fair Value Asset 615 89
Currency swap contract | 2030    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount 26,086 13,633
Fair value Liability 68 803
Fair Value Asset 3,166 0
Currency swap contract | 2033    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount 263  
Fair value Liability 31  
Fair Value Asset 0  
Currency swap contract | 2033    
Disclosure of Financial Assets and Financial Liabilities [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 Financial Assets and Financial Liabilities [Line Items]    
Face amount 12,492 10,000
Fair value Liability 0 3,809
Fair Value Asset 3,588 $ 0
Currency swap contract | Between Twenty One and Twenty Six Years    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Face amount 3,471  
Fair value Liability 0  
Fair Value Asset $ 1,714