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Main Subsidiaries - Summary of Main Subsidiaries Interests (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
CEMEX Colombia S.A [member] |  |
Disclosure of subsidiaries [line items] |  |
Percentage of interest | 99.90% | 99.90%
CEMEX Topmix LLC, CEMEX Supermix LLC and CEMEX Falcon LLC [member] |  |
Disclosure of subsidiaries [line items] |  |
Percentage of interest | 100.00% | 100.00%
Percentage of equity interest | 49.00% |
CEMEX Topmix LLC, CEMEX Supermix LLC and CEMEX Falcon LLC [member] | Parent [member] |  |
Disclosure of subsidiaries [line items] |  |
Percentage of equity interest | 51.00% |
Cemento Bayano, S.A. [member] |  |
Disclosure of subsidiaries [line items] |  |
Percentage of interest | 100.00% | 100.00%
Interest held on treasury | 0.515% |
Trinidad Cement Limited [member] |  |
Disclosure of subsidiaries [line items] |  |
Percentage of interest | 69.80% | 69.80%
Percentage of ownership interest | 74.08% |
Caribbean Cement Company Limited [member] |  |
Disclosure of subsidiaries [line items] |  |
Percentage of interest | 79.00% | 79.00%
Percentage of ownership interest | 79.04% |
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% |
Parent [member] |  |
Disclosure of subsidiaries [line items] |  |
Percentage of ownership interest | 4.96% |

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