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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, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Reconciliation of changes in deferred tax liability (asset) [abstract]              
Deferred Tax (Liability) Asset Beginning Balance $ 104,573,985 $ 98,589,818 $ 69,817,147        
Deferred tax benefit 1,994,063 5,151,492 18,285,052        
Translation effect (8,854,010) (1,687,276) 15,273,228        
Deferred tax benefit (expense) recognized in OCI 2,013,480 2,760,313 (4,760,447)        
Deferred taxes acquired in business combinations (25,827) (240,362) (25,162)        
Hyperinflationary effect in Argentina (4,907,151)            
Effect of adoption of IFRS 9 (Note 2ai) 544,628            
Effect of adoption of IFRS 15 (Note 2ai) (8,725,841)            
Deferred tax (liability) asset ending balance 86,613,327 104,573,985 98,589,818        
Presented in the consolidated statements of financial position as follows:              
Deferred income tax assets       $ 111,186,768 $ 5,649 $ 116,571,349 $ 112,651,699
Deferred income tax liabilities       (24,573,441) $ (1,248) (11,997,364) (14,061,881)
Deferred tax assets and liabilities, net $ 104,573,985 $ 98,589,818 $ 69,817,147 $ 86,613,327   $ 104,573,985 $ 98,589,818