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Financial Instruments - Summary of Debt Summarized by Interest Rates and Currencies (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Short- term | $ 883 |  | $ 16,973 |  |
Long- term | 182,074 | $ 9,339 | 177,022 |  |
Total | 182,957 |  | 193,995 | $ 236,238 | $ 229,343
Floating interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Short- term | 262 |  | 7,282 |  |
Long- term | 66,819 |  | 53,389 |  |
Total | $ 67,081 |  | $ 60,671 |  |
Short-term | 7.80% | 7.80% | 6.10% |  |
Long-term | 3.60% | 3.60% | 3.00% |  |
Fixed interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Short- term | $ 621 |  | $ 9,691 |  |
Long- term | 115,255 |  | 123,633 |  |
Total | $ 115,876 |  | $ 133,324 |  |
Short-term | 4.20% | 4.20% | 4.80% |  |
Long-term | 5.60% | 5.60% | 5.70% |  |
US Dollar [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Short- term | $ 589 |  | $ 6,206 |  |
Long- term | 114,696 |  | 107,508 |  |
Total | $ 115,285 |  | $ 113,714 |  |
Effective rate | 5.80% | 5.80% | 5.90% |  |
Euro [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Short- term | $ 12 |  | $ 9,705 |  |
Long- term | 52,368 |  | 54,906 |  |
Total | $ 52,380 |  | $ 64,611 |  |
Effective rate | 3.30% | 3.30% | 3.50% |  |
Pounds [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Short- term | $ 0 |  | $ 0 |  |
Long- term | 8,631 |  | 9,141 |  |
Total | $ 8,631 |  | $ 9,141 |  |
Effective rate | 2.90% | 2.90% | 2.60% |  |
Philippine pesos [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Short- term | $ 52 |  | $ 0 |  |
Long- term | 5,041 |  | 5,408 |  |
Total | $ 5,093 |  | $ 5,408 |  |
Effective rate | 4.60% | 4.60% | 4.60% |  |
Other Currencies [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Short- term | $ 230 |  | $ 1,062 |  |
Long- term | 1,338 |  | 59 |  |
Total | $ 1,568 |  | $ 1,121 |  |
Effective rate | 5.90% | 5.90% | 6.20% |  |

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