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Taxes - Components of Income Tax Expense (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure Of Income Taxes [line items]        
Current tax expense   $ 18,690 $ 11,652 $ 10,480
Deferred tax expense (income):        
Origination and reversal of temporary differences   (5,824) 127 491
(Recognition) of tax losses, net   1,994 (1,201) (927)
Change in the statutory rate   (41) (102) 125
Total deferred tax income expense   (3,871) (1,176) (311)
Total income taxes $ 745 14,819 $ 10,476 $ 10,169
Mexico [member]        
Disclosure Of Income Taxes [line items]        
Current tax expense   5,500    
Deferred tax expense (income):        
Total income taxes   8,754    
Penalties on income tax   3,253    
Restatement effects on income tax   $ 868