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Income taxes - Effective Consolidated Income Tax Rates (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Major components of tax expense (income) [abstract] |  |  |
Income before income tax | $ 13,659 | $ 17,563 | $ 3,464
Income tax expense | $ (520) | $ (3,125) | $ (2,368)
Effective consolidated income tax rate | (3.80%) | (17.80%) | (68.40%)

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