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Other Liabilities, Provisions, Contingencies and Commitments - Changes in Balance of Provisions Recorded (Parenthetical) (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial liabilities [line items]    
Indemnifiable assets $ 4,510 $ 8,081
Indirect taxes [Member]    
Disclosure of financial liabilities [line items]    
Tax claims 7,840  
Deductibility of a tax goodwill 5,321  
Contingencies guaranteed agreements 8,081  
Indemnifiable assets $ 1,874