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Income Taxes - Summary of Breakdown of Changes in Consolidated Deferred Income Taxes (Detail) - MXN ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in deferred tax liability (asset) [abstract]      
Deferred income tax (charged) credited to the income statement $ (2,569) $ 2,938 $ 331
Deferred income tax (charged) credited to stockholders' equity 193 200 514
Reclassification to other captions in the statement of financial position and in the income statement 27 (560) 531
Change in deferred income tax during the period $ (2,349) $ 2,578 $ 1,376