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Taxes - Tax Loss Carryforwards rollforward (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($)
Major components of tax expense (income) [abstract] |  |  |  |  |  |
Tax loss carryforwards, beginning |  | $ 32,536 |  | $ 29,941 |  |
Derecognized |  | (8,521) |  | (377) |  |
Additions |  | 7,538 |  | 7,194 |  |
Usage of tax losses |  | (2,444) |  | (2,947) |  |
Translation effect of beginning balances |  | (2,491) |  | (1,275) |  |
Tax loss carryforwards, ending |  | 26,618 |  | 32,536 |  | $ 29,941
Taxes withheld on payment of dividends | $ 0 |  | $ 0 |  | $ 0 |
Temporary differences for which tax liability not recognized |  | $ 41,280 |  | $ 49,255 |  | $ 45,305

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- Definition Deferred tax assets operating loss carry forwards foreign currency translation. + References No definition available. + Details
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- Definition The amount of tax loss carryforwards derecognized during the period. + References No definition available. + Details
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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard -URIDate 2020-01-01 + Details
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