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Income Taxes - Summary of Reconciliation of Deferred Tax Assets and Liabilities, Net (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2021
USD ($)
Reconciliation of changes in deferred tax liability (asset) [abstract]        
Deferred Tax (Liability) Asset Beginning Balance $ 66,303,077 $ 88,074,856 $ 86,613,327  
Deferred tax benefit 19,623,461 12,292,014 (3,894,383)  
Translation effect (727,099) 375,105 2,047,915  
Deferred tax benefit recognized in OCI (4,176,197) (26,472,481) 8,838,714  
Deferred taxes acquired in business combinations 0 (2,580,552) (276,568)  
Hyperinflationary effect in Argentina (3,540,962) (5,385,865) (5,254,149)  
Deferred tax (liability) asset ending balance 77,822,839 66,303,077 88,074,856  
Presented in the consolidated statements of financial position as follows:        
Deferred income tax assets 127,287,934 115,370,240 106,167,897 $ 6,184
Deferred income tax liabilities (49,465,095) (49,067,163) (18,093,041) $ (2,403)
Deferred tax assets and liabilities, net 77,822,839 $ 66,303,077 $ 88,074,856  
Disposals see to 2Ac (1,203,203)      
Related discontinued operation $ 1,543,762