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Financial Instruments - Summary of Maturity Analysis for Non-derivative and Derivative Financial Liabilities (Detail) - Liquidity risk [member] - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
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 50.20% 64.30%
0-1 year [member]    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items]    
Notes and bonds $ 5,646  
Loans from banks 6,605  
IFRS 16 lease obligations 89  
Derivative financial liabilities 1,621  
Second 12 months    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items]    
Notes and bonds 4,981  
Loans from banks 1,310  
IFRS 16 lease obligations 53  
Derivative financial liabilities 1,472  
Third 12 months    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items]    
Notes and bonds 45,553  
Loans from banks 558  
IFRS 16 lease obligations 38  
Derivative financial liabilities (3,700)  
Fourth 12 months    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items]    
Notes and bonds 2,746  
Loans from banks 2,825  
IFRS 16 lease obligations 31  
Derivative financial liabilities 1,185  
Fifth 12 months    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items]    
Notes and bonds 4,306  
Loans from banks 3,772  
IFRS 16 lease obligations 24  
Derivative financial liabilities 2,546  
Later than 5 years [member]    
Disclosure Of Maturity Analysis For Non-derivative And Derivative Financial Liabilities [line items]    
Notes and bonds 191,771  
Loans from banks 5,640  
Derivative financial liabilities $ (10,457)