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Taxes - Tax Loss Carryforwards Rollforward (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 MXN ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 MXN ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 MXN ($)	Dec. 31, 2019 USD ($)
Major components of tax expense (income) [abstract]
Tax loss carryforwards, beginning	$ 26,618		$ 32,536
Derecognized	33		(8,521)
Additions	8,306		7,538
Usage of tax losses	(5,602)		(2,444)
Translation effect of beginning balances	685		(2,491)
Tax loss carryforwards, ending	30,040		26,618		$ 32,536
Taxes withheld on payment of dividends		$ 0		$ 0		$ 0
Temporary differences for which tax liability not recognized	$ 44,375		$ 41,280		$ 49,255

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- Definition

Deferred tax assets operating loss carry forwards additions.

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- Definition

Deferred tax assets operating loss carry forwards foreign currency translation.

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- Definition

Deferred tax assets operating loss carry forwards usage of tax losses.

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- Definition

The amount of tax loss carryforwards derecognized during the period.

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- Definition

The amount of taxes withheld on dividends paid to shareholders during the period.

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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 reported in separate financial statements]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2021-01-01
-Paragraph 81
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_f&doctype=Standard
-URIDate 2021-03-24

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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 2021-01-01
-Paragraph 81
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard
-URIDate 2021-03-24

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