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Goodwill and Intangible Assets, Net - Summary of Changes in intangible Asset (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period $ 39,435 $ 41,188 $ 36,566
Additions (disposals), net 2,782 (229) (598)
Business combinations (note 4.1)   76 0
Reclassifications (notes 4.1, 4.2 and 12) (217) (27) 0
Amortization for the period (2,051) (2,037) (1,950)
Impairment losses (186) (50) (25)
Foreign currency translation effects 56 514 7,195
Balance at the end of period 39,819 39,435 41,188
Extraction rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period 33,123 35,047  
Additions (disposals), net (219) 278  
Business combinations (note 4.1)   0  
Reclassifications (notes 4.1, 4.2 and 12) (223) 0  
Amortization for the period (626) (716)  
Impairment losses (186) (38)  
Foreign currency translation effects (5) (1,448)  
Balance at the end of period 31,864 33,123 35,047
Industrial property and trademarks [member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period 565 357  
Additions (disposals), net (32) (783)  
Business combinations (note 4.1)   0  
Reclassifications (notes 4.1, 4.2 and 12) 0 0  
Amortization for the period (93) (110)  
Impairment losses 0 0  
Foreign currency translation effects 27 1,101  
Balance at the end of period 467 565 357
Customer relationships [member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period 7 259  
Additions (disposals), net 0 0  
Business combinations (note 4.1)   0  
Reclassifications (notes 4.1, 4.2 and 12) 0 (27)  
Amortization for the period (7) (225)  
Impairment losses 0 0  
Foreign currency translation effects 0 0  
Balance at the end of period 0 7 259
Mining projects [member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period 701 877  
Additions (disposals), net 120 (148)  
Business combinations (note 4.1)   4  
Reclassifications (notes 4.1, 4.2 and 12) 0 0  
Amortization for the period (12) (12)  
Impairment losses 0 0  
Foreign currency translation effects (82) (20)  
Balance at the end of period 727 701 877
Others intangible assets [Member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period 5,039 4,648  
Additions (disposals), net 2,913 424  
Business combinations (note 4.1)   72  
Reclassifications (notes 4.1, 4.2 and 12) 6 0  
Amortization for the period (1,313) (974)  
Impairment losses 0 (12)  
Foreign currency translation effects 116 881  
Balance at the end of period $ 6,761 $ 5,039 $ 4,648