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Subsequent Events - Additional Information (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Mar. 07, 2018
Dec. 31, 2017
Installment One [Member]    
Disclosure of non-adjusting events after reporting period [line items]    
Dividend installment period   May 04, 2018
Installment Two [Member]    
Disclosure of non-adjusting events after reporting period [line items]    
Dividend installment period   Nov. 06, 2018
Dividend announcement [member]    
Disclosure of non-adjusting events after reporting period [line items]    
Ordinary dividend payable $ 9,221  
Dividends approved date Mar. 16, 2018