v3.26.1
Financial Instruments - Cross Currency Swaps (Details) - MXN ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Notional Amount $ 76,500 $ 67,218
2026    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 5,541  
2027    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 1,797  
2028    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 9,043  
2029    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 0  
2030    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 14,499  
Cross-currency swaps | 2026    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount   4,483
Fair value Liability   0
Fair Value Asset   679
Cross-currency swaps | 2027    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 7,217 7,243
Fair value Liability 218 1
Fair Value Asset 53 547
Cross-currency swaps | 2028    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 11,913 19,300
Fair value Liability 1,111 137
Fair Value Asset 130 836
Cross-currency swaps | 2029    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 8,705 6,819
Fair value Liability (149) (211)
Fair Value Asset 387 0
Cross-currency swaps | 2030    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 1,327 2,182
Fair value Liability (12) 0
Fair Value Asset 370 615
Cross-currency swaps | 2030    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 19,526 26,086
Fair value Liability 550 68
Fair Value Asset 1,505 3,166
Cross-currency swaps | 2032    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 3,683  
Fair value Liability (30)  
Fair Value Asset 30  
Cross-currency swaps | 2033    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 4,722  
Fair value Liability 0  
Fair Value Asset 296  
Cross-currency swaps | Year Ten and Eleven    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 11,797 263
Fair value Liability (3,507) (31)
Fair Value Asset 0 0
Cross-currency swaps | Between Twelve and Twenty Years    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 5,398 10,000
Fair value Liability 0 2,248
Fair Value Asset 2,029 0
Cross-currency swaps | 2043    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount   12,492
Fair value Liability   0
Fair Value Asset   3,588
Cross-currency swaps | 2050    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount 3,471  
Fair value Liability 0  
Fair Value Asset $ 1,118  
Cross-currency swaps | 2050    
Disclosure of detailed information about financial instruments [line items]    
Notional Amount   3,471
Fair value Liability   0
Fair Value Asset   $ 1,714