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Mergers, Acquisitions and Disposals - Summary of Purchase Price to Fair Value of Net Assets Acquired and Reconciliation of Cash Flows (Parenthetical) (Detail) - MXN ($) $ in Millions | Dec. 31, 2017 | May 04, 2017 | Mar. 28, 2017 | Dec. 31, 2016 | Dec. 06, 2016 | Jan. 02, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jan. 25, 2013
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CCFPI [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Non-controlling majority stake acquired | 51.00% |  |  |  |  |  |  |  | 51.00%
Total current assets | $ 9,645 |  |  |  |  |  |  |  |
Total non-current assets | 18,909 |  |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date | 11,524 |  |  |  |  |  |  |  |
Vonpar [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Non-controlling majority stake acquired |  | 100.00% |  |  | 100.00% |  |  |  |
Cash acquired | 1,287 |  | $ 1,287 |  |  |  |  |  |
Total current assets | 2,492 |  |  |  |  |  |  |  |
Total non-current assets | 1,910 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 1,667 |  |  |
Vonpar [member] | Effect of acquisition [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Total current assets |  |  |  | $ (1,898) |  |  |  |  |
Total non-current assets |  |  |  | (8,945) |  |  |  |  |
Goodwill |  |  |  | (5,559) |  |  |  |  |
Grupo Socofar [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Non-controlling majority stake acquired |  |  |  |  |  |  |  | 60.00% |
Cash acquired |  |  |  | 795 |  |  |  |  |
Total current assets |  |  |  | 10,499 |  |  |  |  |
Total non-current assets |  |  |  | 4,240 |  |  |  |  |
Grupo Socofar [member] | Effect of acquisition [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  | 197 |  |  |  |  |
Deferred tax liabilities |  |  |  | 1,009 |  |  |  |  |
Other acquisitions [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Cash acquired |  |  |  | 211 |  |  | $ 71 |  |
Total current assets |  |  |  | 1,125 |  |  | 1,683 |  |
Total non-current assets |  |  |  | 3,316 |  |  | 2,319 |  |
Other acquisitions [member] | Effect of acquisition [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Property, plant and equipment | 32 |  |  |  |  |  | 130 |  |
Other liabilities as of acquisition date | 593 |  |  |  |  |  | 1,202 |  |
Distribution rights [member] | CCFPI [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date | 4,144 |  |  |  |  |  |  |  |
Distribution rights [member] | Vonpar [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date | 14,793 |  |  |  |  |  |  |  |
Distribution rights [member] | Vonpar [member] | Effect of acquisition [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date |  |  |  | 5,191 |  |  |  |  |
Trademark rights [member] | Grupo Socofar [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date |  |  |  | 3,033 |  |  |  |  |
Trademark rights [member] | Grupo Socofar [member] | Effect of acquisition [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date |  |  |  | 3,033 |  |  |  |  |
Trademark rights [member] | Other acquisitions [member] | Effect of acquisition [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date | 836 |  |  |  |  |  | $ 453 |  |
Other [member] | Grupo Socofar [member] | Effect of acquisition [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date |  |  |  | $ 163 |  |  |  |  |
Other [member] | Other acquisitions [member] | Effect of acquisition [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date | $ 983 |  |  |  |  |  |  |  |

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