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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) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
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 | $ 795 | $ 1,033

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

X
- 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