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Post-Employment and Other Non-current Employee Benefits - Summary of Remeasurements of Net Defined Benefit Liability Recognized in Other Comprehensive Income (Detail) - Net benefit cost recognized in consolidated statements of other comprehensive income [member] - MXN ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of net defined benefit liability (asset) [line items]      
Amount accumulated in other comprehensive income as of the beginning of the periods $ 585 $ 462 $ 600
Recognized during the year (obligation liability and plan assets) (169) 75 (49)
Actuarial gains and losses arising from changes in financial assumptions 165 (29) (77)
Foreign exchange rate valuation (gain) (14) 77 (12)
Amount accumulated in other comprehensive income as of the end of the period, net of tax $ 567 $ 585 $ 462