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Non-Controlling Interest in Consolidated Subsidiaries - Summary of Non-Controlling Accumulated Other Comprehensive Loss (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 MXN ($) | Dec. 31, 2017 USD ($) | [1] | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items] |  |  |  |
Remeasurements of the net defined benefits liability | $ (7) |  | $ (167) | $ 144
Valuation of the effective portion of derivative financial instruments | (439) | $ (22) | 1,732 | $ 122
Non-controlling interest [member] |  |  |  |
Disclosure Of Non Controlling Interest In Consolidated Subsidiaries [Line Items] |  |  |  |
Exchange differences on translation foreign operation | 7,150 |  | (199) |
Remeasurements of the net defined benefits liability | (274) |  | (304) |
Valuation of the effective portion of derivative financial instruments | 56 |  | 195 |
Accumulated other comprehensive loss | $ 6,932 |  | $ (308) |
[1] | Convenience translation to U.S. dollars ($) - See Note 2.2.3

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- Definition The amount of other comprehensive income, net of tax, related to exchange differences when financial statements of foreign operations are translated. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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