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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Major components of tax expense (income) [abstract] |  |  |
Initial balance | $ (1,016) | $ (2,063) | $ (2,635)
Deferred tax provision for the year | (8,218) | (5,660) | (1,979)
Deferred tax income net recorded in share of the profit of associates and joint ventures accounted for using the equity method | (67) | 71 | 683
Acquisition of subsidiaries (see Note 4) | (367) | 1,375 | (161)
Unrealized loss on cash flow hedges | (83) | 1,008 | 184
Exchange differences on translation of foreign operations | (1,472) | 3,260 | 1,729
Remeasurements of the net defined benefit liability | 131 | (479) | 121
Retained earnings of associates | (38) | (224) | (396)
Cash flow hedges in foreign investments | (540) | (618) |
Restatement effect of the year and beginning balances associated with hyperinflationary economies | 1,689 | 2,314 | 359
Deconsolidation of subsidiaries | 261 |  |
Ending balance | $ (9,720) | $ (1,016) | $ (2,063)

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