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Executive Share-based Compensation - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 MXN ($) shares | Dec. 31, 2018 COP ($) shares | Dec. 31, 2017 MXN ($) | Dec. 31, 2017 COP ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2016 COP ($)
Disclosure of Terms and Conditions of Share-based Payment Arrangement [Line Items] |  |  |  |  |  |
Share-based compensation expense | $ 706,000,000 |  | $ 817,000,000 |  | $ 742,000,000 |
Commitment payments in cash | $ 0 |  | $ 0 |  |  |
CEMEX Latam Holdings, S.A [member] |  |  |  |  |  |
Disclosure of Terms and Conditions of Share-based Payment Arrangement [Line Items] |  |  |  |  |  |
Share-based compensation program service period | 4 years | 4 years |  |  |  |
Share-based compensation shares issued | 258,511 | 258,511 | 172,981 | 172,981 | 271,461 | 271,461
Share-based compensation shares expected to be issued | shares | 1,162,186 |  |  |  |  |
Weighted average price per granted shares |  | $ 12,347 |  | $ 13,077 |  | $ 13,423
CEMEX Holdings Philippines, Inc. [member] |  |  |  |  |  |
Disclosure of Terms and Conditions of Share-based Payment Arrangement [Line Items] |  |  |  |  |  |
Share-based compensation shares issued | 0 | 0 |  |  |  |
Own shares repurchased | shares | 871,189 | 871,189 |  |  |  |
CPO [Member] |  |  |  |  |  |
Disclosure of Terms and Conditions of Share-based Payment Arrangement [Line Items] |  |  |  |  |  |
Share-based compensation program service period | 4 years | 4 years | 4 years | 4 years | 3 years | 3 years
Share-based compensation annual grant percentage | 25.00% | 25.00% |  |  |  |
Share-based compensation shares issued | 49,300,000 | 49,300,000 | 53,200,000 | 53,200,000 | 53,900,000 | 53,900,000
Share-based compensation shares expected to be issued | shares | 69,500,000 |  |  |  |  |
Weighted average price per granted shares | $ 13.61 |  | $ 14.28 |  | $ 13.79 |
CPO [Member] | Bottom of range [member] |  |  |  |  |  |
Disclosure of Terms and Conditions of Share-based Payment Arrangement [Line Items] |  |  |  |  |  |
Share-based compensation annual grant percentage |  |  | 0.00% | 0.00% |  |
CPO [Member] | Top of range [member] |  |  |  |  |  |
Disclosure of Terms and Conditions of Share-based Payment Arrangement [Line Items] |  |  |  |  |  |
Share-based compensation annual grant percentage |  |  | 200.00% | 200.00% |  |

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