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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 | 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 non-current assets | $ 18,909 |  |  |  |  |  |
Intangible assets recognised as of acquisition date | 11,524 |  |  |  |  |  |
CCFPI [member] | Distribution rights [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date | 4,144 |  |  |  |  |  |
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 non-current assets | 11,344 |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ (1,667) |
Vonpar [member] | Effect of acquisition [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Total non-current assets |  |  |  | $ 490 |  |  |
Goodwill |  |  |  | (5,681) |  |  |
Vonpar [member] | Distribution rights [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date | 14,793 |  |  |  |  |  |
Vonpar [member] | Distribution rights [member] | Effect of acquisition [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date |  |  |  | 5,192 |  |  |
Other acquisitions [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Cash acquired |  |  |  | 211 |  |  |
Total non-current assets |  |  |  | $ 3,316 |  |  |
Other acquisitions [member] | Effect of acquisition [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Property, plant and equipment | 32 |  |  |  |  |  |
Other liabilities as of acquisition date | 593 |  |  |  |  |  |
Other acquisitions [member] | Trademark rights [member] | Effect of acquisition [member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Intangible assets recognised as of acquisition date | 836 |  |  |  |  |  |
Other acquisitions [member] | Other [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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