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Taxes - Components of Income Tax Expense (Details)
$ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
MXN ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Disclosure Of Income Taxes [line items]          
Current tax expense     $ 13,657 $ 18,690 $ 11,652
Deferred tax expense (benefit):          
Origination and reversal of temporary differences     2,115 (5,824) 127
Utilization (recognition) of tax losses, net     1,498 (1,994) 1,201
Change in the statutory rate     4 (41) (102)
Total deferred tax expense (benefit)     621 (3,871) (1,176)
Total income taxes   $ 696 $ 14,278 $ 14,819 $ 10,476
Mexico          
Disclosure Of Income Taxes [line items]          
Current tax expense $ 5,500        
Deferred tax expense (benefit):          
Total income taxes 8,754        
Penalties on income tax 3,253        
Restatement effects on income tax $ 868