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Equity - Additional Information (Detail) |  |  |  |  |  |  |  |  | 12 Months Ended | 42 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 20, 2019 MXN ($) $ / shares | Aug. 29, 2019 MXN ($) $ / shares | May 17, 2019 MXN ($) | Apr. 23, 2019 MXN ($) $ / shares | Nov. 20, 2018 MXN ($) $ / shares | Aug. 21, 2018 MXN ($) $ / shares | May 11, 2018 MXN ($) | Apr. 25, 2018 MXN ($) $ / shares | Dec. 31, 2020 MXN ($) Vote Director Member shares | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Feb. 28, 2014 MXN ($) shares | Apr. 23, 2020 MXN ($) | Apr. 25, 2017 MXN ($)
Disclosure Of Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of acquisition, nominations and compensation corresponding to operating committee members |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |
Dividend payment per share | $ / shares | $ 4.21 | $ 4.21 |  | $ 8.42 | $ 3.81 | $ 3.81 |  | $ 7.62 |  |  |  |  |  |
Dividend payment | $ 2,212,673,000 | $ 2,212,673,000 |  |  | $ 2,002,443,000 | $ 2,002,443,000 |  |  |  |  |  |  |  |
Canceled reserve for repurchase of shares |  |  |  | $ 1,550,000,000 |  |  |  | $ 1,250,000,000 |  |  |  |  |  | $ 995,000,000
Reserve for repurchase of shares |  |  |  |  |  |  |  |  | $ 3,283,374,000 | $ 3,283,374,000 | $ 2,983,374,000 |  | $ 1,550,000 |
Capital reduction per share | $ / shares |  |  |  | $ 3.03 |  |  |  | $ 2.38 |  |  |  |  |  |
Capital reduction |  |  | $ 1,592,494,000 |  |  |  | $ 1,250,870,000 |  |  | 1,592,494,000 | 1,250,870,000 |  |  |
Description of legal reserves |  |  |  |  |  |  |  |  | General Corporate Law requires that at least 5% of the unconsolidated net income of the year, be transferred to the legal reserve until the reserve equals 20% of capital stock at par value (nominal pesos). |  |  |  |  |
Legal reserve |  |  |  |  |  |  |  |  | $ 1,592,551,000 | $ 1,592,551,000 | $ 1,345,709,000 |  |  |
Percentage of legal reserve |  |  |  |  |  |  |  |  | 25.70% | 25.70% | 17.30% |  |  |
Maximum amount of repurchase shares |  |  |  |  |  |  |  |  | $ 3,283,374,000 |  |  |  |  |
Repurchases of shares amount |  |  |  |  |  |  |  |  |  |  |  | $ 1,733,374,000 |  |
Remaining Shares on repurchased |  |  |  |  |  |  |  |  | $ 1,550,000,000 |  |  |  |  |
Number of shares repurchased | shares |  |  |  |  |  |  |  |  | 0 |  |  | 35,424,453 |  |
Non-Mexican and individual shareholders [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional income tax on dividend |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Top of Range [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for repurchase of shares |  |  |  | $ 1,550,000,000 |  |  |  | $ 1,550,000,000 |  |  |  |  | $ 1,550,000 | $ 1,250,000,000
Series BB common stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common stock |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |
Number of directors | Director |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
Series B And BB Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vote per share | Vote |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Maximum percentage of common stock |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Percentage of not having voting rights |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Series B common stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common stock |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Number of directors | Director |  |  |  |  |  |  |  |  | 11 |  |  |  |  |
Percentage of voting rights |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Right to appoint members number | Member |  |  |  |  |  |  |  |  | 7 |  |  |  |  |
Number of members elected to the board of directors at a Shareholders' Meeting | Member |  |  |  |  |  |  |  |  | 1 |  |  |  |  |

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- Definition A component of equity representing the reserve for the redemption of the entity's own shares. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease in equity resulting from a reduction in issued capital. [Refer: Issued capital] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition A component of equity representing reserves created based on legal requirements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Percentage of acquisition nominations and compensation corresponding to operating committee members. + References No definition available. + Details
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