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Equity - Summary of Dividends Declared and Paid (Parenthetical) (Detail) - MXN ($) $ / shares in Units, $ in Millions		12 Months Ended
	Mar. 14, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Dividends [abstract]
Dividends declared and paid	$ 6,991	$ 6,991	$ 6,945	$ 6,405
Dividends declared and paid per share	$ 3.35

X

- Definition

The amount of dividends recognised as distributions to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 107
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-URIDate 2017-03-09

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X

- Definition

The amount of dividends paid per ordinary share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 34
-IssueDate 2017-01-01
-Paragraph 16A
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=34&date=2017-03-01&anchor=para_16A_f&doctype=Standard
-URIDate 2017-03-09

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X

- Definition

Disclosure of dividends.

+ References

No definition available.

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