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Bank Loans and Notes Payables - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2020
USD ($)
Disclosure of detailed information about borrowings [line items]        
Fixed interest rate 5.46%     5.46%
Repayment of bonds   $ 500    
Mexico        
Disclosure of detailed information about borrowings [line items]        
Proceeds from bank loan $ 15,650   $ 9,400  
Uruguay Colombia and Argentina        
Disclosure of detailed information about borrowings [line items]        
Proceeds from bank loan $ 1,184   $ 1,670  
Top of Range        
Disclosure of detailed information about borrowings [line items]        
Fixed interest rate 6.04%   8.39% 6.04%
Bottom of Range        
Disclosure of detailed information about borrowings [line items]        
Fixed interest rate     7.91%  
Argentine peso        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 711      
Uruguayan peso        
Disclosure of detailed information about borrowings [line items]        
Notional amount 759      
8.27% Debt Bonds, Maturing in 2021        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 2,500      
Maturity date 2021 2021    
Fixed interest rate 8.27%     8.27%
5.46% Debt Bonds Maturing in 2023        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 7,500      
Maturity date 2023 2023    
TIIE + 0.25% Debt Bonds Maturing on 2022        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 1,500      
Maturity date 2022 2022    
Floating interest rate 0.25%     0.25%
7.87% Senior Notes, Maturity Date on Nov. 26, 2027        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 8,500      
Maturity date 2027 2027    
Fixed interest rate 7.87%     7.87%
TIIE + 0.08% Debt Bonds Maturing on 2025        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 1,727      
Floating interest rate 0.08%     0.08%
7. 35 Debt Bonds Maturing in 2028        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 3,000      
Fixed interest rate 7.35%     7.35%
2.75 Senior Notes, Maturity Date on January 22, 2030        
Disclosure of detailed information about borrowings [line items]        
Notional amount       $ 1,250
Fixed interest rate 2.75%     2.75%
1.85% Senior Notes, Maturity Date on September 1, 2032        
Disclosure of detailed information about borrowings [line items]        
Notional amount       $ 705
Fixed interest rate 1.85%     1.85%
5.25% Senior Notes, Maturity Date on Nov. 26, 2043        
Disclosure of detailed information about borrowings [line items]        
Notional amount       $ 600
Maturity date November 26, 2043 November 26, 2043    
Fixed interest rate 5.25%     5.25%