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Financial Instruments - Additional Information - Short-Term and Long-Term Debt (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 MXN ($) | Dec. 31, 2017 MXN ($) | Jul. 19, 2017 USD ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($) | Dec. 31, 2014 MXN ($) | Sep. 29, 2014 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of outstanding notes payables | $ 84 |  | $ 84 |  |  |  |  |  |  |  |  |
Percentage of bank loans on total indebtedness | 29.00% |  | 25.00% |  |  |  | 29.00% |  | 25.00% |  |  |
Bank indebtedness |  |  |  |  | $ 3,062 |  | $ 56,879 |  | $ 52,763 |  |  |
Change in amount of bank loan, Diversification effect |  |  |  |  |  |  | $ 193,995 |  | $ 236,238 | $ 229,343 | $ 205,834 |
Percentage of notes payable on total indebtedness | 71.00% |  | 75.00% |  |  |  | 71.00% |  | 75.00% |  |  |
Premiums, fees and issuance costs paid | $ 251 | $ 4,930 | $ 196 | $ 4,061 | 61 | $ 1,047 |  |  |  |  |  |
Issuance costs recognized | 212 | 4,160 | 151 | 3,129 | 35 | 604 |  |  |  |  |  |
Issuance costs of new debt | 39 | 770 | 45 | 932 | 26 | 443 |  |  |  |  |  |
Proportional fees and issuance costs related to the extinguished debt instruments | 16 | $ 310 | $ 37 | $ 767 | $ 31 | $ 541 |  |  |  |  |  |
2017 Credit Agreement [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Bank indebtedness | 4,050 |  |  |  |  |  |  | $ 4,050 |  |  |  |
2014 Credit Agreement [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Bank indebtedness | 3,680 |  |  |  |  |  |  |  |  |  |  | $ 3,680
Risk diversification effect [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Change in amount of bank loan, Diversification effect | $ 280 |  |  |  |  |  |  |  |  |  |  |

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