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Main Subsidiaries - Summary of Main Subsidiaries Interests (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
CEMEX Topmix LLC, CEMEX Supermix LLC and CEMEX Falcon LLC [member]
Disclosure of subsidiaries [line items]
Percentage of interest	100.00%	100.00%
Ownership percentage	49.00%
Remaining ownership percentage	51.00%
CEMEX Colombia S.A [member]
Disclosure of subsidiaries [line items]
Percentage of interest	99.90%	99.90%
Cemento Bayano, S.A. [member]
Disclosure of subsidiaries [line items]
Percentage of interest	100.00%	100.00%
Interest held on treasury	0.515%
Common Stock [member] | CEMEX Colombia S.A [member]
Disclosure of subsidiaries [line items]
Percentage of interest	99.70%
Preferred Shares [Member] | CEMEX Colombia S.A [member]
Disclosure of subsidiaries [line items]
Percentage of interest	98.90%

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Percentage of ownership interest held on treasury.

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- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2017-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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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
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The proportion of the voting rights in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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