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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% |

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