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Financial Instruments - Cross Currency Swaps (Details) - Cross-currency swaps - MXN ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Less than one year    
Disclosure of detailed information about financial instruments [line items]    
Notional amount $ 4,872 $ 4,575
Fair value Liability   (5)
Fair Value Asset 982 169
1-2 years    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 24,403 376
Fair Value Asset 12,379 23
2-3 years    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 1,400 24,103
Fair Value Asset 438 10,808
3-4 years    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 10,667 1,577
Fair value Liability (1,564) (9)
Fair Value Asset 154 264
4-5 years    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 6,348 10,750
Fair value Liability (1) (2,481)
Fair Value Asset 220  
Sixth 12 months    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 7,204  
Fair Value Asset 366  
Seventh 12 months    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 16,389 6,982
Fair value Liability (21) (464)
Fair Value Asset 655 80
Later than seven years and not later than eight years    
Disclosure of detailed information about financial instruments [line items]    
Notional amount   1,519
Fair Value Asset   122
8-9 years    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 3,911  
Fair value Liability (8)  
Fair Value Asset 404  
9-10 years    
Disclosure of detailed information about financial instruments [line items]    
Notional amount   3,790
Fair value Liability   (107)
Fair Value Asset   192
22-23 years    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 8,869 8,869
Fair Value Asset $ 1,553 $ 2,706