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Business Combinations, Discontinued Operations, Sale of Other Disposal Groups and Selected Financial Information by Reportable Segment and Line of Business - Summary of Balance sheet Information by Geographic Segment (Parenthetical) (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure - Business Combinations, Discontinued Operations, Sale of Other Disposal Groups and Selected Financial Information by Reportable Segment and Line of Business - Summary of Balance sheet Information by Geographic Segment [Abstract] |  |  |
Capital expenditure incurred | $ 12,141 | $ 9,514 | $ 12,676

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- Definition Capital expenditures increase (decrease), property, plant and equipment. + References No definition available. + Details
Name: | cx_CapitalExpendituresIncreaseDecreasePropertyPlantAndEquipment
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure - Business Combinations, Discontinued Operations, Sale of Other Disposal Groups and Selected Financial Information by Reportable Segment and Line of Business - Summary of Balance sheet Information by Geographic Segment [Abstract] + References No definition available. + Details
Name: | cx_DisclosureBusinessCombinationsDiscontinuedOperationsSaleOfOtherDisposalGroupsAndSelectedFinancialInformationByReportableSegmentAndLineOfBusinessSummaryOfBalanceSheetInformatio_XaAbstract
Namespace Prefix: | cx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration