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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 Consolidating Statements of Operations by Geographic Operating Segments (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Caribbean TCL [member] | Trinidad Cement Limited [member]
Disclosure of operating segments [line items]
Non-controlling interest ownership percentage	30.17%	30.17%
CEMEX Latam Holdings, S.A. [member]
Disclosure of operating segments [line items]
Non-controlling interest ownership percentage	7.63%	26.83%
CEMEX Holdings Philippines, Inc. [member]
Disclosure of operating segments [line items]
Non-controlling interest ownership percentage	22.16%	33.22%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

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- Definition

The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2020-01-01
-Paragraph 12
-Subparagraph c
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-URIDate 2020-01-01

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