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Goodwill and Intangible Assets, Net - Summary of Consolidated Goodwill, Intangible Assets and Deferred Charges (Detail) - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill $ 234,909 $ 247,507
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 195,474 206,319
Extraction rights [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 33,123 35,047
Industrial property and trademarks [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 565 357
Customer relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 7 259
Mining projects [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 701 877
Others intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 5,039 4,648
Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 255,603 267,139
Cost [member] | Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 195,474 206,319
Cost [member] | Extraction rights [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 39,603 40,995
Cost [member] | Industrial property and trademarks [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 929 707
Cost [member] | Customer relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 3,859 4,343
Cost [member] | Mining projects [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 797 961
Cost [member] | Others intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 14,941 13,814
Accumulated Depreciation, amortization and Impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill (20,694) (19,632)
Accumulated Depreciation, amortization and Impairment [member] | Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 0 0
Accumulated Depreciation, amortization and Impairment [member] | Extraction rights [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill (6,480) (5,948)
Accumulated Depreciation, amortization and Impairment [member] | Industrial property and trademarks [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill (364) (350)
Accumulated Depreciation, amortization and Impairment [member] | Customer relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill (3,852) (4,084)
Accumulated Depreciation, amortization and Impairment [member] | Mining projects [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill (96) (84)
Accumulated Depreciation, amortization and Impairment [member] | Others intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill $ (9,902) $ (9,166)