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Non Controlling Interest in Consolidated Subsidiaries - Summary of Non Controlling Interest in Consolidated Subsidiaries (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
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Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items] |  |  |  |  |
Non-controlling interests | $ 6,806 | $ 347 | $ 18,141 | $ 7,096 | $ 3,986
Mexico [member] |  |  |  |  |
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items] |  |  |  |  |
Non-controlling interests | 5,700 |  | 5,994 | 5,879 |
Colombia [member] |  |  |  |  |
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items] |  |  |  |  |
Non-controlling interests | 21 |  | 23 | 22 |
Brazil [member] |  |  |  |  |
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items] |  |  |  |  |
Non-controlling interests | $ 1,085 |  | 1,224 | $ 1,195 |
Philippinnes [member] |  |  |  |  |
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [line items] |  |  |  |  |
Non-controlling interests |  |  | $ 10,900 |  |

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- Definition The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 12 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_12_f&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph q -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_q&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 10 -IssueDate 2018-01-01 -Paragraph 22 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=10&date=2018-03-01&anchor=para_22&doctype=Standard -URIDate 2018-03-16 + Details
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