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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, 2020 USD ($) | [1] | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Other income: |  |  |  |  |
Gain on sale of long-lived assets |  | $ 274 | $ 330 |  | $ 399
Cancellation of contingencies |  | 344 | 565 |  | 162
Foreign exchange gain related to operating activities |  | 0 | 79 |  | 0
Joint venture sale |  | 212 | 0 |  | 0
Other |  | 664 | 916 |  | 8
Other income | $ 75 | 1,494 | 1,890 | [2] | 569
Other expenses: |  |  |  |  |
Provisions for contingencies |  | 842 | 1,305 |  | 818
Loss on the retirement of long-lived assets |  | 291 | 318 |  | 103
Loss on sale of long-lived assets |  | 178 | 288 |  | 221
Loss on the retirement of intangible assets |  | 375 | 0 |  | 0
Impairment |  | 2,501 | 948 |  | 432
Severance payments (2) |  | 192 | 1,062 |  | 224
Donations |  | 361 | 288 |  | 332
Foreign exchange gain (loss), net |  | 69 | 0 |  | (25)
Other |  | 296 | 171 |  | 345
Other expenses | $ 256 | $ 5,105 | $ 4,380 | [2] | $ 2,450
[1] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] | The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated – See note 3.18

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