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Mergers, Acquisitions and Disposals - Summary of Selected Income Statement Information Related to Business Acquisition (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 MXN ($) | Dec. 31, 2017 USD ($) | [1] | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
Disclosure of detailed information about business combination [line items] |  |  |  |
Income before income taxes | $ 47,789 | $ 2,434 | $ 35,063 | $ 31,208
Vonpar [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Total revenues |  |  | 1,628 |
Income before income taxes |  |  | 380 |
Net income |  |  | 252 |
Grupo Socofar [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Total revenues |  |  |  | 7,583
Income before income taxes |  |  |  | 394
Net income |  |  |  | 354
Other acquisitions [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Total revenues |  |  | 2,400 | 20,262
Income before income taxes |  |  | (66) | 176
Net income |  |  | $ (80) | $ 120
CCFPI [member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Total revenues | 20,524 |  |  |
Income before income taxes | 1,265 |  |  |
Net income | $ 896 |  |  |
[1] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

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