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Mergers and Acquisitions - Summary of Pro Forma Financial Data of Historical Financial Statements Related to Business Combinations (Detail) - Aggregated Individually Immaterial Business Combinations $ in Millions	12 Months Ended
	Dec. 31, 2018 MXN ($)
Disclosure of Detailed Information About Business Combination [Line Items]
Total revenues	$ 185,737
Income before taxes	17,763
Net income	$ 15,500

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The profit (loss) of the combined entity as though the acquisition date for all business combinations that occurred during the year had been as of the beginning of the annual reporting period. [Refer: Business combinations [member]; Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2019-01-01
-Paragraph B64
-Subparagraph q
-Clause ii
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- Definition

The revenue of the combined entity as though the acquisition date for all business combinations that occurred during the year had been as of the beginning of the annual reporting period. [Refer: Business combinations [member]; Revenue]

+ References

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-Name IFRS
-Number 3
-IssueDate 2019-01-01
-Paragraph B64
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-Clause ii
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-URIDate 2019-03-27

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- Definition

Profit loss before tax of combined entity

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