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Financial Instruments - Summary of Debt Summarized by Interest Rates and Currencies (Detail) $ in Millions, $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($) | Dec. 31, 2014 MXN ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Short- term |  | $ 16,973 |  | $ 1,222 |  |
Long- term | $ 9,892 | 177,022 | $ 11,379 | 235,016 |  |
Total |  | 193,995 |  | 236,238 | $ 229,343 | $ 205,834
Floating interest rate [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Short- term |  | 7,282 |  | 519 |  |
Long- term |  | 53,389 |  | 64,550 |  |
Total |  | $ 60,671 |  | $ 65,069 |  |
Short-term | 6.10% | 6.10% | 9.70% | 9.70% |  |
Long-term | 3.00% | 3.00% | 4.40% | 4.40% |  |
Fixed interest rate [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Short- term |  | $ 9,691 |  | $ 703 |  |
Long- term |  | 123,633 |  | 170,466 |  |
Total |  | $ 133,324 |  | $ 171,169 |  |
Short-term | 4.80% | 4.80% | 4.40% | 4.40% |  |
Long-term | 5.70% | 5.70% | 6.50% | 6.50% |  |
US Dollar [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Short- term |  | $ 6,206 |  | $ 114 |  |
Long- term |  | 107,508 |  | 179,675 |  |
Total |  | $ 113,714 |  | $ 179,789 |  |
Effective rate | 5.90% | 5.90% | 6.30% | 6.30% |  |
Euro [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Short- term |  | $ 9,705 |  | $ 50 |  |
Long- term |  | 54,906 |  | 55,292 |  |
Total |  | $ 64,611 |  | $ 55,342 |  |
Effective rate | 3.50% | 3.50% | 4.30% | 4.30% |  |
Pounds [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Short- term |  | $ 0 |  | $ 0 |  |
Long- term |  | 9,141 |  | 0 |  |
Total |  | $ 9,141 |  | $ 0 |  |
Effective rate | 2.60% | 2.60% | 0.00% | 0.00% |  |
Philippine pesos [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Short- term |  | $ 0 |  | $ 0 |  |
Long- term |  | 5,408 |  | 0 |  |
Total |  | $ 5,408 |  | $ 0 |  |
Effective rate | 4.60% | 4.60% | 0.00% | 0.00% |  |
Pesos [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Short- term |  | $ 0 |  | $ 648 |  |
Long- term |  | 0 |  | 0 |  |
Total |  | $ 0 |  | $ 648 |  |
Effective rate | 0.00% | 0.00% | 4.40% | 4.40% |  |
Other Currencies [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Short- term |  | $ 1,062 |  | $ 410 |  |
Long- term |  | 59 |  | 49 |  |
Total |  | $ 1,121 |  | $ 459 |  |
Effective rate | 6.20% | 6.20% | 10.20% | 10.20% |  |

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