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Discontinued operations - Summary of the Discontinued Operation (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |
Total revenues | $ 9,231 | [1] | $ 183,615 | $ 194,471 | [2] | $ 182,342
Cost of goods sold | 5,068 | [1] | 100,804 | 106,964 | [2] | 98,404
Gross profit | 4,163 | [1] | 82,811 | 87,507 | [2] | 83,938
Financial income, net | (53) | [1] | (1,047) | (1,230) | [2] | (1,004)
Income before taxes from discontinued operations | (794) | [3] | (15,796) | (18,278) | [4] | (16,964)
Net income from discontinued operations | 0 | [1] | 0 | 0 | [2] | 3,366
Less- amount attributable to non-controlling interest | 0 | [1] | 0 | 0 | [2] | (391)
Accumulated currency translation effect | $ 379 | [5] | $ 7,543 | $ 5,579 | [6] | 7,234
Discontinued Operations |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |
Total revenues |  |  |  |  |  | 24,167
Cost of goods sold |  |  |  |  |  | 17,360
Gross profit |  |  |  |  |  | 6,807
Operating expenses |  |  |  |  |  | 5,750
Other expenses, net |  |  |  |  |  | 7
Financial income, net |  |  |  |  |  | (185)
Foreign exchange gain, net |  |  |  |  |  | (73)
Income before taxes from discontinued operations |  |  |  |  |  | 1,308
Income taxes |  |  |  |  |  | 466
Net income from discontinued operations |  |  |  |  |  | 842
Less- amount attributable to non-controlling interest |  |  |  |  |  | 391
Net income from operations attributable to equity holders of the parent. |  |  |  |  |  | 451
Accumulated currency translation effect |  |  |  |  |  | (811)
Gain on sale of subsidiary |  |  |  |  |  | 3,335
Net income attributable to the equity holders of the parent from discontinued operations |  |  |  |  |  | $ 2,975
[1] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] | The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated – See note 3.18
[3] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[4] | The Company initially adopted IFRS 16 at January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18
[5] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[6] | The Company initially adopted IFRS 16 at January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_99&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_103&doctype=Standard -URIDate 2019-03-27 + Details
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