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Mergers, Acquisitions and Disposals - Summary of Purchase Price to Fair Value of Net Assets Acquired and Reconciliation of Cash Flows (Detail) R$ in Millions, $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 MXN ($) | May 04, 2017 USD ($) | Mar. 28, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 06, 2016 BRL (R$) | Dec. 06, 2016 MXN ($) | Dec. 31, 2015 MXN ($) | Sep. 30, 2015 MXN ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Goodwill | $ 0 |  |  |  |  |  |  |
CCFPI [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Total current assets | 9,645,000,000 |  |  |  |  |  |  |
Total non-currentassets | 18,909,000,000 |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date | 11,524,000,000 |  |  |  |  |  |  |
Total assets | 32,698,000,000 |  |  |  |  |  |  |
Total liabilities | (10,101,000,000) |  |  |  |  |  |  |
Net assets acquired | 22,597,000,000 |  |  |  |  |  |  |
Non-controling interest | (11,072,000,000) |  |  |  |  |  |  |
Equity interest held previously | 22,109,000,000 |  |  |  |  |  |  |
Carrying value of CCFPI investment derecognized | 11,690,000,000 |  |  |  |  |  |  |
Loss as a result of remeasuring to fair value the equity interest | 166,000,000 |  |  |  |  |  |  |
Gain on derecognition of other comprehensive income | 2,996,000,000 |  |  |  |  |  |  |
Total profit from remeasurement of previously equity interest | 2,830,000,000 |  |  |  |  |  |  |
CCFPI [member] | Distribution rights [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date | 4,144,000,000 |  |  |  |  |  |  |
Vonpar [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Total current assets | 2,492,000,000 |  |  |  |  |  |  |
Total non-currentassets | 1,910,000,000 |  |  |  |  |  |  |
Net assets acquired | 19,325,000,000 | $ 4,082 |  |  |  |  |  |
Goodwill | 2,152,000,000 |  |  |  |  |  |  |
Total consideration transferred | 21,478,000,000 |  |  |  | R$ 3,508 | $ 20,992,000,000 |  |
Amount to be paid through Promissory Notes | (6,992,000,000) |  |  |  |  |  |  |
Cash acquired | (1,287,000,000) |  | $ (1,287,000,000) |  |  |  |  |
Amount recognized as embedded financial instrument | 485,000,000 |  |  |  |  |  |  |
Net cash paid | 13,198,000,000 |  |  |  | R$ 1,730 | $ 10,370,000,000 |  |
Vonpar [member] | Distribution rights [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date | $ 14,793,000,000 |  |  |  |  |  |  |
Grupo Socofar [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Total current assets |  |  |  | $ 10,499,000,000 |  |  |  |
Total non-currentassets |  |  |  | 4,240,000,000 |  |  |  |
Total assets |  |  |  | 17,772,000,000 |  |  |  |
Total liabilities |  |  |  | (12,564,000,000) |  |  |  |
Net assets acquired |  |  |  | 5,208,000,000 |  |  |  |
Non-controling interest |  |  |  | (2,082,000,000) |  |  |  |
Goodwill |  |  |  | 4,559,000,000 |  |  |  |
Total consideration transferred |  |  |  | 7,685,000,000 |  |  |  | $ 7,685,000,000
Cash acquired |  |  |  | (795,000,000) |  |  |  |
Grupo Socofar [member] | Trademark rights [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date |  |  |  | 3,033,000,000 |  |  |  |
Other acquisitions [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Total current assets |  |  |  | 1,125,000,000 |  |  | $ 1,683,000,000 |
Total non-currentassets |  |  |  | 3,316,000,000 |  |  | 2,319,000,000 |
Total assets |  |  |  | 4,441,000,000 |  |  | 4,002,000,000 |
Total liabilities |  |  |  | (2,062,000,000) |  |  | (2,955,000,000) |
Net assets acquired |  |  |  | 2,379,000,000 |  |  | 1,047,000,000 |
Non-controling interest |  |  |  | 35,000,000 |  |  |  |
Equity interest held previously |  |  |  | 369,000,000 |  |  |  |
Goodwill |  |  |  | 3,204,000,000 |  |  | 5,027,000,000 |
Total consideration transferred |  |  |  | 5,612,000,000 |  |  | 6,074,000,000 |
Cash acquired |  |  |  | (211,000,000) |  |  | $ (71,000,000) |
Net cash paid |  |  |  | $ 5,618,000,000 |  |  |  |

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