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Employee Benefits - Summary of Employee Benefit Expenses (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Classes of employee benefits expense [abstract]      
Wages and salaries $ 58,745 $ 51,874 $ 49,393
Social security costs 10,486 9,800 8,814
Employee profit sharing 1,294 1,209 1,506
Post-employment benefits 842 700 625
Share-based payments 401 351 468
Termination benefits 132 159 325
Employee benefits expense $ 71,904 $ 64,093 $ 61,131