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Non Controlling Interest in Consolidated Subsidiaries - Summary of Non Controlling Interest in Consolidated Subsidiaries (Detail) $ in Millions, $ in Millions | Dec. 31, 2020 USD ($) | [1] | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($)
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Disclosure of non controlling interest in consolidated subsidiaries [Line Items] |  |  |  |  |  |
Non-controlling interests | $ 281 | $ 5,583 | $ 6,751 | [2] | $ 6,806 | $ 18,141
Mexico |  |  |  |  |  |
Disclosure of non controlling interest in consolidated subsidiaries [Line Items] |  |  |  |  |  |
Non-controlling interests |  | 4,823 | 5,671 |  | 5,700 |
Colombia |  |  |  |  |  |
Disclosure of non controlling interest in consolidated subsidiaries [Line Items] |  |  |  |  |  |
Non-controlling interests |  | 22 | 21 |  | 21 |
Brazil |  |  |  |  |  |
Disclosure of non controlling interest in consolidated subsidiaries [Line Items] |  |  |  |  |  |
Non-controlling interests |  | $ 738 | $ 1,059 |  | $ 1,085 |
[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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- Definition The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph 12 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_12_f&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph q -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_q&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 10 -IssueDate 2019-01-01 -Paragraph 22 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=10&code=ifrs-tx-2019-en-r&anchor=para_22&doctype=Standard -URIDate 2019-03-27 + Details
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