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Executive Share-based Compensation - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 USD ($) shares $ / shares | Dec. 31, 2019 USD ($) shares $ / shares | Dec. 31, 2018 USD ($) shares $ / shares | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Terms and Conditions of Share-based Payment Arrangement [Line Items] |  |  |  |  |
Share-based compensation expense | $ | $ 29,000,000 | $ 32,000,000 | $ 34,000,000 |  |
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 |  |  |  |
Share-based compensation shares issued | 1,383,518 | 393,855 | 258,511 |  |
Share-based compensation shares expected to be issued | 2,895,944 |  |  |  |
Weighted average price per granted shares | $ / shares | $ 0.72 | $ 1.31 | $ 2.14 |  |
CEMEX Holdings Philippines, Inc. [member] |  |  |  |  |
Disclosure of Terms and Conditions of Share-based Payment Arrangement [Line Items] |  |  |  |  |
Own shares repurchased | 11,546,350 | 4,961,130 |  |  |
CPO [Member] |  |  |  |  |
Disclosure of Terms and Conditions of Share-based Payment Arrangement [Line Items] |  |  |  |  |
Share-based compensation program service period | 4 years |  |  | 4 years | 3 years
Share-based compensation annual grant percentage | (25.00%) | (25.00%) |  |  |
Share-based compensation shares issued | 83,800,000 | 27,400,000 | 49,300,000 |  |
Share-based compensation shares issued |  | 21,200,000 |  |  |
Share-based compensation shares expected to be issued | 248,400,000 |  |  |  |
Weighted average price per granted shares | $ / shares | $ 0.3379 | $ 0.6263 | $ 0.7067 |  |
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% |
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% |

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