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Goodwill and Intangible Assets, Net - Summary of Changes in intangible Asset (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period $ 41,188 $ 36,566 $ 32,940
Additions (disposals), net (229) (598) (186)
Business combinations 76 0 616
Reclassifications (notes 4.1, 4.2 and 12) (27) 0 1
Amortization for the period (2,037) (1,950) (1,572)
Impairment losses (50) (25) (10)
Foreign currency translation effects 514 7,195 4,777
Balance at the end of period 39,435 41,188 36,566
Extraction rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period 35,047 30,327  
Additions (disposals), net 278 201  
Business combinations 0 0  
Reclassifications (notes 4.1, 4.2 and 12) 0 0  
Amortization for the period (716) (712)  
Impairment losses (38) (6)  
Foreign currency translation effects (1,448) 5,237  
Balance at the end of period 33,123 35,047 30,327
Industrial property and trademarks [member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period 357 622  
Additions (disposals), net (783) (760)  
Business combinations 0 0  
Reclassifications (notes 4.1, 4.2 and 12) 0 0  
Amortization for the period (110) (293)  
Impairment losses 0 0  
Foreign currency translation effects 1,101 788  
Balance at the end of period 565 357 622
Customer relationships [member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period 259 1,004  
Additions (disposals), net 0 0  
Business combinations 0 0  
Reclassifications (notes 4.1, 4.2 and 12) (27) 0  
Amortization for the period (225) (658)  
Impairment losses 0 0  
Foreign currency translation effects 0 (87)  
Balance at the end of period 7 259 1,004
Mining projects [member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period 877 805  
Additions (disposals), net (148) (382)  
Business combinations 4 0  
Reclassifications (notes 4.1, 4.2 and 12) 0 0  
Amortization for the period (12) (12)  
Impairment losses 0 0  
Foreign currency translation effects (20) 466  
Balance at the end of period 701 877 805
Others intangible assets [Member]      
Disclosure of detailed information about intangible assets [line items]      
Balance at beginning of period 4,648 3,808  
Additions (disposals), net 424 343  
Business combinations 72 0  
Reclassifications (notes 4.1, 4.2 and 12) 0 0  
Amortization for the period (974) (275)  
Impairment losses (12) (19)  
Foreign currency translation effects 881 791  
Balance at the end of period $ 5,039 $ 4,648 $ 3,808