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Commitments - Summary of Contractual Obligations (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Disclosure of Detailed Information About Borrowings [Line Items]        
Long-term debt $ 9,892 $ 11,379 $ 177,022 $ 235,016
Finance lease obligations 175 107    
Convertible notes 906 1,205    
Total debt and other financial obligations 10,973 12,691    
Operating leases 494 515    
Interest payments on debt 3,073 3,996    
Pension plans and other benefits 1,587 1,414    
Purchases of raw materials, fuel and energy 4,326 4,440    
Total contractual obligations 20,453 $ 23,056 401,901 477,720
Less than 1 year [Member]        
Disclosure of Detailed Information About Borrowings [Line Items]        
Long-term debt 798   (15,685) $ (752)
Finance lease obligations 36      
Convertible notes 379      
Total debt and other financial obligations 1,213      
Operating leases 109      
Interest payments on debt 448      
Pension plans and other benefits 156      
Purchases of raw materials, fuel and energy 649      
Total contractual obligations 2,575   50,599  
1-3 years [Member]        
Disclosure of Detailed Information About Borrowings [Line Items]        
Long-term debt 519      
Finance lease obligations 87      
Convertible notes 527      
Total debt and other financial obligations 1,133      
Operating leases 181      
Interest payments on debt 968      
Pension plans and other benefits 307      
Purchases of raw materials, fuel and energy 810      
Total contractual obligations 3,399   66,790  
3-5 Years [Member]        
Disclosure of Detailed Information About Borrowings [Line Items]        
Long-term debt 2,411      
Finance lease obligations 52      
Convertible notes 0      
Total debt and other financial obligations 2,463      
Operating leases 136      
Interest payments on debt 809      
Pension plans and other benefits 316      
Purchases of raw materials, fuel and energy 866      
Total contractual obligations 4,590   90,193  
More than 5 Years [Member]        
Disclosure of Detailed Information About Borrowings [Line Items]        
Long-term debt 6,164   120,275  
Finance lease obligations 0      
Convertible notes 0      
Total debt and other financial obligations 6,164      
Operating leases 68      
Interest payments on debt 848      
Pension plans and other benefits 808      
Purchases of raw materials, fuel and energy 2,001      
Total contractual obligations $ 9,889   $ 194,319