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Equity - Summary of Dividends Declared and Paid (Parenthetical) (Detail) - MXN ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 09, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Dividends [abstract] |  |  |  |
Dividends declared and paid | $ 7,038 | $ 7,038 | $ 6,991 | $ 6,945
Dividends declared and paid per share | $ 3.35 |  |  |

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- 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 2018-01-01 -Paragraph 107 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_107&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2018-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=34&date=2018-03-01&anchor=para_16A_f&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Disclosure of dividends. + References No definition available. + Details
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