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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, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Reconciliation of changes in deferred tax liability (asset) [abstract]              
Deferred Tax (Liability) Asset Beginning Balance $ 86,613,327 $ 104,573,985 $ 98,589,818        
Deferred tax benefit (3,894,384) 1,994,063 5,151,492        
Translation effect 2,047,916 (8,854,010) (1,687,276)        
Deferred tax benefit recognized in OCI 8,838,714 2,013,480 2,760,313        
Deferred taxes acquired in business combinations (276,568) (25,827) (240,362)        
Hyperinflationary effect in Argentina (5,254,149) (4,907,151)          
Effect of adoption of IFRS 9   544,628          
Effect of adoption of IFRS 15   (8,725,841)          
Deferred tax (liability) asset ending balance 88,074,856 86,613,327 104,573,985        
Presented in the consolidated statements of financial position as follows:              
Deferred income tax assets       $ 106,167,897 $ 5,634 $ 111,186,768 $ 116,571,349
Deferred income tax liabilities       (18,093,041) $ (960) (24,573,441) (11,997,364)
Deferred tax assets and liabilities, net $ 86,613,327 $ 104,573,985 $ 98,589,818 $ 88,074,856   $ 86,613,327 $ 104,573,985