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Financial Instruments - Interest Rate Swaps (Details) - Interest rate swap - MXN ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Less than one year    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount $ 131 $ 449
Fair value Liability (1) (6)
1-2 years    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 12,129 458
Fair value Liability   (16)
Fair Value Asset 177  
2-3 years    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 2,367 12,918
Fair value Liability (39) (492)
3-4 years    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount   2,294
Fair value Liability   $ (126)
Later than 5 years    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 6,175  
Fair Value Asset $ 170