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Non-Controlling Interest in Consolidated Subsidiaries - Summary of Changes in FEMSA's Non-Controlling Interest (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 Non Controlling Interest In Consolidated Subsidiaries [Line Items] |  |  |  |
Balance at beginning of the year | $ 74,266 |  |  |
Capitalization of issued shares to former owners of Vonpar in Coca-Cola FEMSA | 4,082 |  |  |
Contribution from non-controlling interest | 272 |  | $ 892 | $ 250
Balance at end of the year | 86,621 | $ 4,411 | 74,266 |
Non-controlling interest [member] |  |  |  |
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items] |  |  |  |
Balance at beginning of the year | 74,266 |  | 60,332 | 59,649
Net income of non controlling interest | (5,202) |  | 6,035 | 5,593
Other comprehensive income (loss): | 7,240 |  | 9,463 | (2,999)
Exchange differences on translation of foreign operation | 7,349 |  | 9,238 | (3,110)
Remeasurements of the net defined benefits liability | 30 |  | (63) | 75
Valuation of the effective portion of derivative financial instruments | (139) |  | 288 | 36
Capitalization of issued shares to former owners of Vonpar in Coca-Cola FEMSA | 2,867 |  |  |
Other acquisitions and remeasurments | (50) |  | 1,710 | 1,133
Contribution from non-controlling interest | 272 |  | 892 | 250
Equity instruments |  |  | (485) |
Dividends | (3,622) |  | (3,690) | (3,351)
Share based payment | 50 |  | 9 | 57
Balance at end of the year | $ 86,621 |  | $ 74,266 | $ 60,332
[1] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

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