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Employee Benefits - Summary of Employee Benefit Expenses (Detail) - MXN ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Classes of employee benefits expense [abstract]      
Wages and salaries $ 53,056 $ 39,459 $ 39,459
Social security costs 9,860 6,114 6,114
Employee profit sharing 1,209 1,506 1,243
Post employment benefits 815 625 493
Share-based payments 351 468 463
Termination benefits 455 503 503
Employee benefits expense $ 65,746 $ 48,675 $ 48,275