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Other Income and Expenses - Summary of Other Income and Expenses (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | [1] | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Disclosure of Other Operating Income Expense [Line Items] |  |  |  |  |
Gain on sale of shares |  |  | $ 123 |  |
Gain on sale of other assets | $ 344 |  |  |  |
Gain on sale of long-lived assets | 174 |  | 210 |  | $ 170
Sale of waste material | 13 |  | 3 |  | 50
Write off-contingencies(see Note 25.5) |  |  |  |  | 329
Recoveries from previous years |  |  |  |  | 466
Insurance rebates | 10 |  | 6 |  | 10
Foreign exchange gain | 123 |  |  |  |
Others | 9 |  | 1,621 |  | 132
Other income | 673 | $ 34 | 31,951 | [2] | 1,157
Contingencies associated with prior acquisitions or disposals | 138 |  | 39 |  | 1,582
Loss on sale of equity financial assets |  |  |  |  | 8
Loss on sale of other assets |  |  | 148 |  | 159
Recoveries of prior years | 116 |  | 35 |  |
Impairment of long-lived assets | 432 |  | 2,063 |  |
Disposal of long-lived assets | 518 |  | 451 |  | 238
Suppliers provisions |  |  | 398 |  |
Foreign exchange losses related to operating activities |  |  | 2,524 |  | 2,370
Non-income taxes from Colombia |  |  |  |  | 53
Contingencies | 518 |  | 636 |  |
Severance payments | 264 |  | 243 |  | 98
Donations | 528 |  | 242 |  | 203
Legal fees and other expenses from past acquisitions | 149 |  | 612 |  | 241
Venezuela deconsolidation effect |  |  | 26,123 |  |
Other | 284 |  | 352 |  | 957
Other expenses | $ 2,947 |  | 33,866 |  | $ 5,909
Heineken group shares [member] |  |  |  |  |
Disclosure of Other Operating Income Expense [Line Items] |  |  |  |  |
Gain on sale of shares |  |  | $ 29,989 |  |
[1] | Convenience translation to U.S. dollars ($) - See Note 2.2.3
[2] | Revised to reflect the discontinued Philippines operations of Coca-Cola FEMSA - See Note 4.2.1

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