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Post-Employment and Other Non-current Employee Benefits - Summary of Employee Benefits Expense (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee benefits expense [line items]      
Total employee benefits expense $ 27,838 $ 28,551 $ 23,281
Cost of goods sold [member]      
Employee benefits expense [line items]      
Wages and salaries 4,639 4,827 4,106
Social security costs 1,467 1,234 799
Employee profit sharing 75 142 125
Pension and seniority premium costs (Note 15.4) 53 57 56
Share-based payment expense (Note 16.2) 6 11 4
Selling and distribution expenses [member]      
Employee benefits expense [line items]      
Wages and salaries 12,695 13,526 11,513
Social security costs 4,456 4,571 2,911
Employee profit sharing 484 485 453
Pension and seniority premium costs (Note 15.4) 183 65 65
Share-based payment expense (Note 16.2) 7 18 6
Administrative expenses [member]      
Employee benefits expense [line items]      
Wages and salaries 2,625 2,839 2,551
Social security costs 588 472 337
Employee profit sharing 31 56 30
Pension and seniority premium costs (Note 15.4) 56 66 66
Post-employment benefits other (Note 15.4) 312 5 5
Share-based payment expense (Note 16.2) $ 161 $ 177 $ 254