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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)

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