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Income tax - Schedule of Unrecognized Tax Benefits (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred tax assets and liabilities [abstract] |  |  |
Balance of tax positions at beginning of the period | $ 1,132 | $ 1,190 | $ 1,396
Additions for tax positions of prior periods | 663 | 200 | 134
Additions for tax positions of current period | 16 | 90 | 71
Reductions for tax positions related to prior periods and other items | (32) | (131) | (95)
Settlements and reclassifications | (119) | (163) | (204)
Expiration of the statute of limitations | (138) | (126) | (231)
Foreign currency translation effects | 49 | 72 | 119
Balance of tax positions at end of the period | $ 1,571 | $ 1,132 | $ 1,190

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- References No definition available. + Details
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