Intangible Assets - Amortization (Details) - MXN ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Allocation Of Amortisation Expenses [abstract]
Amortisation Expense Reported in Cost of Goods Sold	$ 288	$ 317	$ 399
Amortisation Expense Reported in Administrative Expenses	1,412	953	858
Amortisation Expense Reported in Selling Expenses	765	542	656
Amortization expense	$ 2,465	$ 1,812	$ 1,913

The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2020-01-01
-Paragraph 118
-Subparagraph e
-Clause vi
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_vi&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration