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Income Taxes - Schedule of Changes in Net Deferred Income Tax Asset (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Major components of tax expense (income) [abstract] |  |  |
Balance at the beginning of the period | $ (9,720) | $ (1,016) | $ (2,063)
Deferred tax provision for the period | (311) | (8,218) | (5,660)
Deferred tax income net recorded in share of the profit of equity accounted investees | 165 | (67) | 71
Acquisition of subsidiaries (see Note 4) | (316) | (367) | 1,375
Unrealized loss on cash flow hedges | (445) | (83) | 1,008
Exchange differences on translation of foreign operations | (1,762) | (1,472) | 3,260
Remeasurements of the net defined benefit liability | 543 | 131 | (479)
Retained earnings of equity accounted investees | 54 | (38) | (224)
Cash flow hedges in foreign investments | 310 | (540) | (618)
Restatement effect of the period and beginning balances associated with hyperinflationary economies | 438 | 1,689 | 2,314
Disposal of subsidiaries | 387 |  |
Deconsolidation of subsidiaries |  | 261 |
Balance at the end of the period | $ (10,657) | $ (9,720) | $ (1,016)

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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 + Details
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