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Goodwill and Intangible Assets, Net - Summary of Consolidated Goodwill, Intangible Assets and Deferred Charges (Detail) - MXN ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill $ 234,598 $ 234,909
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 194,779 195,474
Extraction rights [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 31,864 33,123
Industrial property and trademarks [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 467 565
Customer relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 0 7
Mining projects [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 727 701
Others intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 6,761 5,039
Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 257,265 255,603
Cost [member] | Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 194,779 195,474
Cost [member] | Extraction rights [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 38,881 39,603
Cost [member] | Industrial property and trademarks [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 864 929
Cost [member] | Customer relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 3,859 3,859
Cost [member] | Mining projects [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 834 797
Cost [member] | Others intangible assets [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill 18,048 14,941
Accumulated Depreciation, amortization and Impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill (22,667) (20,694)
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 (7,017) (6,480)
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 (397) (364)
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 (3,859) (3,852)
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 (107) (96)
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 $ (11,287) $ (9,902)