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Employee Benefits - Employee Benefit Expenses (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Classes of employee benefits expense [abstract]      
Wages and salaries $ 68,312 $ 64,776 $ 58,745
Social security costs 11,595 11,494 10,486
Employee profit sharing 1,112 1,205 1,294
Post-employment benefits 1,002 795 842
Share-based payments 575 200 405
Termination benefits 201 169 132
Employee benefits expense $ 82,797 $ 78,639 $ 71,904