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Financial Instruments - Summary of Long Term Notes Payable (Parenthetical) (Detail) | 12 Months Ended |  |  |  |  |  |  |
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Dec. 31, 2017 EUR (€) | Dec. 10, 2017 USD ($) | Nov. 28, 2017 USD ($) | Nov. 28, 2017 MXN ($) | Nov. 28, 2017 EUR (€) | Oct. 12, 2017 USD ($) | Sep. 25, 2017 USD ($) | May 31, 2017 EUR (€) | Feb. 28, 2017 USD ($) | Dec. 31, 2016 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
3-Month LIBOR rate | 1.6943% |  |  |  |  |  |  |  |  | 0.9979%
CEMEX, SAB. de CV. December 2024 Notes [member] | 2.75% Senior secured notes [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Issue price | € | € 650,000,000 |  |  |  |  |  |  |  |  |
CEMEX Finance LLC October 2022 Notes [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Purchase of principal amount of borrowings |  |  |  |  |  |  | $ 701,000,000 |  |  | $ 739,000,000
CEMEX, S.A.B. de C.V. January 2021 Notes [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Purchase of principal amount of borrowings |  |  |  |  |  |  |  |  | $ 385,000,000 | 242,000,000
CEMEX, S.A.B. de C.V. December 2019 Notes [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Purchase of principal amount of borrowings |  | $ 611,000,000 |  |  |  |  |  |  | $ 90,000,000 | 219,000,000
CEMEX, S.A.B. de C.V. October 2018 Variable Notes [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Purchase of principal amount of borrowings |  |  |  |  |  |  |  |  |  | $ 178,000,000
Notes redeemed october two thousand twenty two [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Purchase of principal amount of borrowings |  |  |  |  |  | $ 343,000,000 |  |  |  |
Euro [member] | CEMEX, S.A.B. de C.V. January 2022 [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Purchase of principal amount of borrowings | € |  |  |  |  | € 400,000,000 |  |  |  |  |
Euro [member] | CEMEX Finance LLC April 2021 Notes [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Purchase of principal amount of borrowings | € |  |  |  |  |  |  |  | € 400,000,000 |  |
US Dollar [member] | CEMEX, S.A.B. de C.V. January 2022 [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Purchase of principal amount of borrowings |  |  | $ 480,000,000 |  |  |  |  |  |  |
Pesos [Member] | CEMEX, S.A.B. de C.V. January 2022 [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Purchase of principal amount of borrowings |  |  |  | $ 9,432,000,000 |  |  |  |  |  |

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