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Bank Loans and Notes Payables - Summary of Financial Instruments by Type of Interest Rate (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cross-currency swaps [member] | Units of investments to Mexican pesos and variable rate [member] | 6.0% fixed to 5.9% variable interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   $ 2,500
Interest pay rate   5.90%
Interest receive rate   4.20%
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] | Variable to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 8.90% 7.40%
Interest receive rate 4.00% 4.00%
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]    
Notional amount $ 19,818 $ 19,451
Interest pay rate 9.10% 8.80%
Interest receive rate 3.90% 4.10%
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]    
Notional amount $ 19,617 $ 21,210
Interest pay rate 6.00% 11.90%
Interest receive rate 2.00% 1.90%
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]    
Notional amount $ 19,617 $ 22,834
Interest pay rate 6.60% 12.40%
Interest receive rate 2.50% 2.00%
Cross-currency swaps [member] | Chilean peso [member] | Variable to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 620 $ 827
Interest pay rate 6.90% 6.90%
Interest receive rate 3.90% 6.20%
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] | Variable to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 3,515 $ 3,591
Interest pay rate 5.80% 6.40%
Interest receive rate 4.50% 5.10%
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   5.90%
Interest receive rate   6.00%
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 8.90% 7.40%
Less than 1 year [member] | Cross-currency swaps [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 24,760 $ 2,707
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]    
Notional amount $ 8,782  
Interest pay rate 6.30%  
Interest receive rate 2.70%  
Less than 1 year [member] | 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]    
Notional amount $ 15,571  
Interest pay rate 6.70%  
Interest receive rate 2.60%  
1-2 years [member] | Cross-currency swaps [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 6,263 39,262
1-2 years [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]    
Notional amount $ 6,263  
Interest pay rate 5.20%  
Interest receive rate 0.40%  
1-2 years [member] | Interest rate swap [member] | Mexican peso [member] | Variable to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 65  
Interest pay rate 6.50%  
Interest receive rate 3.70%  
2-3 years [member] | Cross-currency swaps [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 18,428 7,022
2-3 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]    
Notional amount $ 9,868  
Interest pay rate 9.00%  
Interest receive rate 3.90%  
2-3 years [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]    
Notional amount $ 4,571  
Interest pay rate 6.60%  
Interest receive rate 2.90%  
2-3 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]    
Notional amount $ 620  
Interest pay rate 6.90%  
Interest receive rate 3.90%  
3-4 years [member] | Cross-currency swaps [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 4,853 19,474
3-4 years [member] | 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]    
Notional amount $ 4,046  
Interest pay rate 6.10%  
Interest receive rate 1.90%  
3-4 years [member] | Interest rate swap [member] | Mexican peso [member] | Variable to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 650  
Interest pay rate 7.60%  
Interest receive rate 3.80%  
4-5 years [member] | Cross-currency swaps [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount   $ 5,076
4-5 years [member] | Interest rate swap [member] | Mexican peso [member] | Variable to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 875  
Interest pay rate 6.60%  
Interest receive rate 4.50%  
Later than 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  
Later than 5 years [member] | Cross-currency swaps [member] | U.S. dollars to Mexican pesos [member] | Variable to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest pay rate 8.90%  
Interest receive rate 4.00%  
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]    
Notional amount $ 9,951  
Interest pay rate 9.10%  
Interest receive rate 4.00%  
Later than 5 years [member] | Interest rate swap [member] | Mexican peso [member] | Variable to fixed interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Notional amount $ 1,925  
Interest pay rate 5.80%  
Interest receive rate 4.50%