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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
	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

X

- Definition

Capital expenditures increase (decrease), property, plant and equipment.

+ References

No definition available.

+ Details

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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
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