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Main Subsidiaries - Summary of Main Subsidiaries Interests (Parenthetical) (Detail) | 12 Months Ended
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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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- 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 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 19B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_19B_c&doctype=Standard -URIDate 2017-03-09 + Details
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