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Other Income and Expenses - Summary of other income and expenses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
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