Goodwill and Intangible Assets, Net - Summary of Changes in intangible Asset (Parenthetical) (Detail) - MXN ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]
Carrying amount of internal-use software	$ 4,459	$ 2,981
Computer software [member]
Disclosure of detailed information about intangible assets [line items]
Capitalized direct costs	$ 2,583	$ 1,422	$ 769

The amount of intangible assets representing computer software. [Refer: Intangible assets other than goodwill]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 38
-IssueDate 2018-01-01
-Paragraph 119
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_119_c&doctype=Standard
-URIDate 2018-03-16

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