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Bank Loans and Notes Payable - Summary of Financial Instruments by Type of Interest Rate (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cross-currency swaps [member] | U.S. dollars to Mexican pesos [member] | 7.4% fixed to 7.2% variable interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 11,403 $ 11,403
Cross-currency swaps [member] | U.S. dollars to Mexican pesos [member] | Fixed to variable interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 9.80% 8.90%
Interest receive rate 4.00% 4.00%
Notional amount $ 19,768 $ 19,818
Cross-currency swaps [member] | U.S. dollars to Mexican pesos [member] | Fixed to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 9.10% 9.10%
Interest receive rate 3.90% 3.90%
Cross-currency swaps [member] | U.S. dollars to Brazilian reais [member] | Fixed to variable interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 4.70% 6.00%
Interest receive rate 0.40% 2.00%
Notional amount $ 4,652 $ 19,617
Cross-currency swaps [member] | U.S. dollars to Brazilian reais [member] | Fixed to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 8.30%  
Interest receive rate 2.90%  
Notional amount $ 4,559  
Cross-currency swaps [member] | U.S. dollars to Brazilian reais [member] | Variable to variable interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate   6.60%
Interest receive rate   2.50%
Notional amount   $ 19,617
Cross-currency swaps [member] | U.S. dollars to Brazilian reais [member] | Variable to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 9.00%  
Interest receive rate 3.60%  
Notional amount $ 13,483  
Cross-currency swaps [member] | Chilean peso [member] | Variable to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 6.90% 6.90%
Interest receive rate 4.60% 3.90%
Notional amount $ 364 $ 620
Interest rate swap [member] | U.S. dollars to Mexican pesos [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 11,403  
Interest rate swap [member] | Mexican peso [member] | 6.0% variable to 5.9% fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 6.30% 5.80%
Interest receive rate 4.00% 4.50%
Notional amount $ 2,847 $ 3,515
Interest rate swap [member] | Mexican peso [member] | 7.4% variable to 7.2% fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 7.20% 7.20%
Interest receive rate 9.80% 8.90%
Less than 1 year [member] | Cross-currency swaps [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 4,738 $ 24,760
Less than 1 year [member] | Cross-currency swaps [member] | U.S. dollars to Brazilian reais [member] | Fixed to variable interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 4.70%  
Interest receive rate 0.40%  
Notional amount $ 4,652  
Less than 1 year [member] | Interest rate swap [member] | Mexican peso [member] | 6.0% variable to 5.9% fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 6.50%  
Interest receive rate 3.80%  
Notional amount $ 19  
1-2 years [member] | Cross-currency swaps [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 18,126 6,263
1-2 years [member] | Cross-currency swaps [member] | U.S. dollars to Mexican pesos [member] | Fixed to variable interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 9,841  
1-2 years [member] | Cross-currency swaps [member] | U.S. dollars to Mexican pesos [member] | Fixed to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 9.00%  
Interest receive rate 3.90%  
1-2 years [member] | Cross-currency swaps [member] | U.S. dollars to Brazilian reais [member] | Fixed to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 8.30%  
Interest receive rate 2.90%  
Notional amount $ 4,559  
1-2 years [member] | Cross-currency swaps [member] | Chilean peso [member] | Variable to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 6.90%  
Interest receive rate 4.60%  
Notional amount $ 364  
2-3 years [member] | Cross-currency swaps [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 4,774 18,428
2-3 years [member] | Cross-currency swaps [member] | U.S. dollars to Brazilian reais [member] | Variable to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 7.90%  
Interest receive rate 2.90%  
Notional amount $ 4,035  
2-3 years [member] | Interest rate swap [member] | Mexican peso [member] | 6.0% variable to 5.9% fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 7.60%  
Interest receive rate 3.80%  
Notional amount $ 513  
3-4 years [member] | Cross-currency swaps [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   $ 4,853
3-4 years [member] | Interest rate swap [member] | Mexican peso [member] | 6.0% variable to 5.9% fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 6.60%  
Interest receive rate 4.50%  
Notional amount $ 617  
4-5 years [member] | Cross-currency swaps [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount 396  
4-5 years [member] | Cross-currency swaps [member] | U.S. dollars to Mexican pesos [member] | 7.4% fixed to 7.2% variable interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 11,403  
4-5 years [member] | Cross-currency swaps [member] | U.S. dollars to Mexican pesos [member] | Fixed to variable interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 9.80%  
Interest receive rate 4.00%  
Notional amount $ 3,038  
4-5 years [member] | Cross-currency swaps [member] | U.S. dollars to Mexican pesos [member] | Fixed to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 7.70%  
Interest receive rate 3.90%  
4-5 years [member] | Cross-currency swaps [member] | U.S. dollars to Brazilian reais [member] | Variable to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 9.50%  
Interest receive rate 3.90%  
Notional amount $ 9,448  
4-5 years [member] | Interest rate swap [member] | Mexican peso [member] | 6.0% variable to 5.9% fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 5.80%  
Interest receive rate 3.90%  
Notional amount $ 1,698  
4-5 years [member] | Interest rate swap [member] | Mexican peso [member] | 7.4% variable to 7.2% fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 7.20%  
Interest receive rate 9.80%  
Later than 5 years [member] | Cross-currency swaps [member] | U.S. dollars to Mexican pesos [member] | Fixed to variable interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 6,889  
Later than 5 years [member] | Cross-currency swaps [member] | U.S. dollars to Mexican pesos [member] | Fixed to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 9.70%  
Interest receive rate 4.00%