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Income Taxes - Schedule of Recognized in Consolidated Statement of Other Comprehensive Income (Detail) - MXN ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Major components of tax expense (income) [abstract]      
Unrealized loss on cash flow hedges $ (191) $ 745 $ 93
Exchange differences on translation of foreign operations 387 4,478 1,699
Remeasurements of the net defined benefit liability (154) (49) 49
Share of the other comprehensive income of associates and joint ventures (1,465) (1,385) 193
Total income tax cost recognized in OCI $ (1,423) $ 3,789 $ 2,034