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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)

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