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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, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Reconciliation of changes in deferred tax liability (asset) [abstract]              
Deferred Tax (Liability) Asset Beginning Balance $ 98,589,818 $ 69,817,147 $ 52,310,097        
Deferred tax benefit 5,151,492 18,285,052 15,752,347        
Effect of translation (1,687,276) 15,273,228 (6,259,252)        
Deferred tax benefit (expense) recognized in OCI 2,760,313 (4,760,447) 7,935,733        
Deferred taxes acquired in business combinations (240,362) (25,162) 78,223        
Deferred tax (liability) asset ending balance 104,573,985 98,589,818 69,817,147        
Presented in the consolidated statements of financial position as follows:              
Deferred income tax assets       $ 116,571,349 $ 5,891 $ 112,651,699 $ 81,407,012
Deferred income tax liabilities       (11,997,364) $ (606) (14,061,881) (11,589,865)
Deferred tax assets and liabilities, net $ 98,589,818 $ 69,817,147 $ 52,310,097 $ 104,573,985   $ 98,589,818 $ 69,817,147