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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
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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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