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Financial Instruments - Net Effects Of Derivative Financial Instruments That Did Not Met Hedging Criteria (Details) - Derivative Contract Not Met Hedging Criteria - Market value gain on financial instruments - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Embedded Derivative |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net gains (losses) on change in fair value of derivatives |  |  | $ 4
Cross-currency swaps |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net gains (losses) on change in fair value of derivatives | $ 80 | $ (212) | $ (293)

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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_85&doctype=Standard -URIDate 2021-03-24 + Details
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