Operating Expenses, Depreciation and Amortization - Summary of Depreciation and Amortization Recognized (Detail) - MXN ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Depreciation and amortisation expense [abstract]
Depreciation and amortization expense included in cost of sales	$ 14,181	$ 14,143	$ 14,177
Depreciation and amortization expense included in administrative, selling and distribution and logistics expenses	1,889	1,845	1,810
Depreciation and amortization	$ 16,070	$ 15,988	$ 15,987

Adjustments for depreciation and amortisation expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Depreciation and amortisation expense; Profit (loss)]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 20
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_20_b&doctype=Standard
-URIDate 2018-03-16

Name:	ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration