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Financial Instruments - Summary of Maturity Analysis for Non-derivative and Derivative Financial Liabilities (Details) - Liquidity risk - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items]    
Percentage of outstanding consolidated total indebtedness at the level of its sub-holding companies 47.40% 50.20%
Less than one year    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items]    
Notes and bonds $ 4,439  
Loans from banks 3,428  
IFRS 16 lease obligations 55  
Derivative financial liabilities 993  
1-2 years    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items]    
Notes and bonds 17,183  
Loans from banks 1,941  
IFRS 16 lease obligations 44  
Derivative financial liabilities 1,233  
2-3 years    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items]    
Notes and bonds 2,918  
Loans from banks 2,732  
IFRS 16 lease obligations 32  
Derivative financial liabilities 404  
3-4 years    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items]    
Notes and bonds 4,551  
Loans from banks 79  
IFRS 16 lease obligations 25  
Derivative financial liabilities 1,672  
4-5 years    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items]    
Notes and bonds 5,271  
Loans from banks 28  
IFRS 16 lease obligations 1  
Derivative financial liabilities 147  
Later than 5 years    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items]    
Notes and bonds 233,001  
Derivative financial liabilities $ (11,787)