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Main Subsidiaries - Summary of Main Subsidiaries Interests (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
CEMEX Espana, S.A. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX España, S.A |
Country of incorporation of subsidiary | Spain |
Proportion of ownership interest in subsidiary | 99.90% | 99.90%
CEMEX, Inc. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX, Inc. |
Country of incorporation of subsidiary | United States of America |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
CEMEX Latam Holdings, S.A. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX Latam Holdings, S.A. |
Country of incorporation of subsidiary | Spain |
Proportion of ownership interest in subsidiary | 92.40% | 73.20%
CEMEX (Costa Rica), S.A. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX (Costa Rica), S.A. |
Country of incorporation of subsidiary | Costa Rica |
Proportion of ownership interest in subsidiary | 99.20% | 99.20%
CEMEX Nicaragua, S.A. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX Nicaragua, S.A. |
Country of incorporation of subsidiary | Nicaragua |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
Assiut Cement Company [Member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | Assiut Cement Company |
Country of incorporation of subsidiary | Egypt |
Proportion of ownership interest in subsidiary | 95.80% | 95.80%
CEMEX Colombia S.A [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX Colombia, S.A. |
Country of incorporation of subsidiary | Colombia |
Proportion of ownership interest in subsidiary | 99.70% | 99.70%
Cemento Bayano, S.A. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | Cemento Bayano, S.A. |
Country of incorporation of subsidiary | Panama |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
CEMEX Dominicana, S.A. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX Dominicana, S.A. |
Country of incorporation of subsidiary | Dominican Republic |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
Trinidad Cement Limited [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | Trinidad Cement Limited |
Country of incorporation of subsidiary | Trinidad and Tobago |
Proportion of ownership interest in subsidiary | 69.80% | 69.80%
Caribbean Cement Company Limited [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | Caribbean Cement Company Limited |
Country of incorporation of subsidiary | Jamaica |
Proportion of ownership interest in subsidiary | 79.00% | 79.00%
CEMEX de Puerto Rico Inc. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX de Puerto Rico Inc. |
Country of incorporation of subsidiary | Puerto Rico |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
CEMEX France Gestion (S.A.S.) [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX France Gestion (S.A.S.) |
Country of incorporation of subsidiary | France |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
CEMEX Holdings Philippines, Inc. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX Holdings Philippines, Inc. |
Country of incorporation of subsidiary | Philippines |
Proportion of ownership interest in subsidiary | 77.80% | 66.80%
Solid Cement Corporation [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | Solid Cement Corporation |
Country of incorporation of subsidiary | Philippines |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
APO Cement Corporation [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | APO Cement Corporation |
Country of incorporation of subsidiary | Philippines |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
CEMEX U.K. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX U.K. |
Country of incorporation of subsidiary | United Kingdom |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
CEMEX Deutschland, AG. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX Deutschland, AG. |
Country of incorporation of subsidiary | Germany |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
CEMEX Czech Republic, s.r.o. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX Czech Republic, s.r.o. |
Country of incorporation of subsidiary | Czech Republic |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
CEMEX Polska sp. Z.o.o.[member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX Polska sp. Z.o.o. |
Country of incorporation of subsidiary | Poland |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
CEMEX Holdings (Israel) Ltd. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX Holdings (Israel) Ltd. |
Country of incorporation of subsidiary | Israel |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
CEMEX Topmix LLC, CEMEX Supermix LLC and CEMEX Falcon LLC [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX Topmix LLC, CEMEX Supermix LLC and CEMEX Falcon LLC |
Country of incorporation of subsidiary | United Arab Emirates |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
Neoris N.V. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | Neoris N.V |
Country of incorporation of subsidiary | The Netherlands |
Proportion of ownership interest in subsidiary | 99.80% | 99.80%
CEMEX International Trading, LLC [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | CEMEX International Trading LLC |
Country of incorporation of subsidiary | United States of America |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%
Transenegy, Inc. [member] |  |
Disclosure of subsidiaries [line items] |  |
Name of subsidiary | Transenergy, Inc. |
Country of incorporation of subsidiary | United States of America |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%

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