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Components of Other Comprehensive (Loss) Income - Summary of Movement on Components of Other Comprehensive (Loss) Income (Detail) $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Controlling interest: |  |  |  |
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes | $ (3,765,688) | $ (191) | $ 622,424 | $ (6,673,731)
Translation effect of foreign entities | (64,314,032) |  | (18,309,877) | 107,498,708
Total other comprehensive (loss) income items for the year, net of deferred taxes | (67,322,442) | $ (3,421) | (24,721,250) | 115,647,505
Total equity attributable to equity holders of the parent [member] |  |  |  |
Controlling interest: |  |  |  |
Valuation of the derivative financial instruments, net of deferred taxes |  |  | 12,292 | 48,496
Unrealized (loss) gain on equity investments at fair value, net of deferred taxes | (3,765,688) |  | 622,424 | (6,673,731)
Translation effect of foreign entities | (61,223,458) |  | (21,683,333) | 104,178,880
Remeasurement of defined benefit plan, net of deferred taxes | 652,722 |  | (7,075,606) | 14,771,770
Non-controlling interest of the items above | (2,986,018) |  | 3,402,973 | 3,322,090
Total other comprehensive (loss) income items for the year, net of deferred taxes | $ (67,322,442) |  | $ (24,721,250) | $ 115,647,505

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- Definition The amount of other comprehensive income attributable to non-controlling interests. [Refer: Non-controlling interests; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_85&doctype=Standard -URIDate 2018-03-16 + Details
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