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Share capital - Additional Information (Detail) - MXN ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of classes of share capital [line items]      
Capital stock 2,100,832,000 2,072,922,000 2,072,922,000
Percentage of income to be transferred to reserve 5.00%    
Minimum percentage of capital stock at nominal value to be transferred to reserve 20.00%    
Amount in legal reserve $ 164 $ 164 $ 164
Balance in legal reserve fund $ 7,506    
Ordinary shares [member]      
Disclosure of classes of share capital [line items]      
Capital stock 2,100,832,262    
Fixed capital stock (nominal value) per share $ 934    
Common shares, no par value $ 0    
Series A shares [member]      
Disclosure of classes of share capital [line items]      
Capital stock 992,078,000 992,078,000 992,078,000
Equity threshold percentage 51.00%    
Series D share [member]      
Disclosure of classes of share capital [line items]      
Capital stock 583,546,000 583,546,000 583,546,000
Equity threshold percentage 49.00%