Information by Segment - Summary of Geographic Disclosure (Detail) - MXN ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Disclosure of geographical areas [line items]
Total Non Current Assets	$ 454,657	$ 398,774
Mexico and Central America [member]
Disclosure of geographical areas [line items]
Total Non Current Assets	233,686	195,310
South America [member]
Disclosure of geographical areas [line items]
Total Non Current Assets	137,247	120,003
Europe [member]
Disclosure of geographical areas [line items]
Total Non Current Assets	$ 83,724	$ 83,461

The amount of non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets and rights arising under insurance contracts. [Refer: Deferred tax assets; Financial instruments, class [member]; Non-current assets; Types of insurance contracts [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2018-01-01
-Paragraph 33
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_33_b&doctype=Standard
-URIDate 2018-03-16

Name:	ifrs-full_NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant