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Equity Investments at Fair Value Through OCI and Other Short-term Investments - Additional Information (Detail) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items] |  |  |
Dividends received | $ 2,122,826 | $ 1,773,336 | $ 2,605,333
Investments accounted for using equity method Koninklijke KPN [member] |  |  |
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items] |  |  |
Other short-term investments | 4,603,284 | 10,145,615 |
Changes in fair value of investment | (1,952,414) | 883,408 |
Dividends received | 2,119,668 | 1,742,242 | $ 2,605,333
Equity and other short term investments [member] | Investments accounted for using equity method Koninklijke KPN [member] |  |  |
Disclosure of equity investments at fair value through other comprehensive income and other short-term investments [line items] |  |  |
Equity investments at fair value through OCI | $ 50,033,111 | $ 37,572,410 |

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- Definition Disclosure of equity investments at fair value through other comprehensive income and other short-term investments. + References No definition available. + Details
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- Definition Other short term investments2. + References No definition available. + Details
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- Definition The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 11A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_11A_c&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_h&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The gains (losses) from changes in the fair value of investment property. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2020-01-01 -Paragraph 76 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2020-en-r&anchor=para_76_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of dividends recognised as income. Dividends are distributions of profits to holders of equity investments in proportion to their holdings of a particular class of capital. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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