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Related Parties - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Transactions Between Related Parties [Line Items]
Amount of compensation of CEMEX Board of Directors	$ 35	$ 40	$ 38
Performance Bonuses [Member]
Disclosure of Transactions Between Related Parties [Line Items]
Amount of compensation of CEMEX Board of Directors	29	34	29
Executive Share-Based Compensation Programs [Member]
Disclosure of Transactions Between Related Parties [Line Items]
Amount of compensation of CEMEX Board of Directors	$ 6	$ 6	$ 9

X

- Definition

The amount of remuneration paid or payable to the entity's directors.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2020-01-01

+ Details

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X

- 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.

+ References

No definition available.

+ Details

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- Details

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- Details

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