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Commitments - Summary of Contractual Obligations (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2018
USD ($)
Disclosure of Detailed Information About Borrowings [Line Items]          
Long-term debt $ 182,074   $ 177,022   $ 9,339
Finance lease obligations         143
Convertible notes         533
Total debt and other financial obligations         10,015
Operating leases   $ 1,207      
Interest payments on debt         2,780
Pension plans and other benefits         1,352
Acquisition of property, plant and equipment 12,969 130 $ 12,419 $ 13,279  
Purchases of raw materials, fuel and energy   5,157      
Total contractual obligations 405,595       20,641
Less than 1 year [Member]          
Disclosure of Detailed Information About Borrowings [Line Items]          
Long-term debt         7
Finance lease obligations         36
Convertible notes         19
Total debt and other financial obligations         62
Operating leases   186      
Interest payments on debt         508
Pension plans and other benefits         148
Acquisition of property, plant and equipment   87      
Purchases of raw materials, fuel and energy   702      
Total contractual obligations 33,267       1,693
1-3 years [Member]          
Disclosure of Detailed Information About Borrowings [Line Items]          
Long-term debt         1,788
Finance lease obligations         87
Convertible notes         514
Total debt and other financial obligations         2,389
Operating leases   351      
Interest payments on debt         960
Pension plans and other benefits         270
Acquisition of property, plant and equipment   43      
Purchases of raw materials, fuel and energy   955      
Total contractual obligations 97,621       4,968
3-5 Years [Member]          
Disclosure of Detailed Information About Borrowings [Line Items]          
Long-term debt         2,347
Finance lease obligations         19
Convertible notes         0
Total debt and other financial obligations         2,366
Operating leases   231      
Interest payments on debt         777
Pension plans and other benefits         270
Acquisition of property, plant and equipment   0      
Purchases of raw materials, fuel and energy   1,230      
Total contractual obligations 95,774       4,874
More than 5 Years [Member]          
Disclosure of Detailed Information About Borrowings [Line Items]          
Long-term debt 101,431       5,197
Finance lease obligations         1
Convertible notes         0
Total debt and other financial obligations         5,198
Operating leases   439      
Interest payments on debt         535
Pension plans and other benefits         664
Acquisition of property, plant and equipment   0      
Purchases of raw materials, fuel and energy   $ 2,270      
Total contractual obligations $ 178,933       $ 9,106