Accounting Policies - Share-based Payment Agreements (Details) - MXN ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Agreements
Share-based compensation expense	$ 984,356	$ 1,129,644	$ 1,327,549
Share-based compensation credited in consolidated stockholder's equity	$ 962,806	$ 1,108,094	$ 1,305,999

The increase (decrease) in equity resulting from share-based payment transactions. [Refer: Equity]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 106
-Subparagraph d
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d_iii&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration