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Financial Instruments - Additional Information - Credit Agreement, Facilities Agreement and Financing Agreement (Detail) - USD ($) $ in Millions |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2023 | Dec. 17, 2020 | Nov. 04, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 13, 2020 | Apr. 02, 2019 | Dec. 31, 2017 | Jul. 19, 2017
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Long Term debt |  |  |  | $ 9,160.0 | $ 9,303.0 |  |  |  |
Later than two years and not later than three years [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Long Term debt |  |  |  | 772.0 |  |  |  |  |
CEMEX Holdings Philippines, Inc. [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Maximum capital expenditure |  |  |  | 500.0 | 500.0 |  |  |  |
CEMEX Latam Holdings, S.A [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Maximum capital expenditure |  |  |  | 1,500.0 | 1,500.0 |  |  |  |
Acquisitions and investments in joint ventures |  |  |  | $ 400.0 | $ 400.0 |  |  |  |
Pounds [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 2.50% | 3.20% |  |  |  |
Long Term debt |  |  |  | $ 329.0 | $ 433.0 |  |  |  |
Mexico, Pesos |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 6.80% |  |  |  |  |
Long Term debt |  |  |  | $ 334.0 |  |  |  |  |
2017 Credit Agreement [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Bank indebtedness |  |  |  | 2,420.0 | $ 2,897.0 |  |  |  | $ 4,050.0
Revolving Credit Facility Amount Extended |  |  |  |  |  | $ 1.1 | $ 1,060.0 |  |
Repurchase of Share Issuance Amount |  |  | $ 500.0 |  |  |  |  |  |
Allowance for disposals of non controlling interests per year |  |  | $ 100.0 |  |  |  |  |  |
Revolving Credit Facility Amount Extended Commitments |  |  |  | 1.1 |  |  |  |  |
2017 Credit Agreement [member] | Pounds [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Nominal value of Debt Converted in to Other Currency |  |  |  | 82.0 |  |  |  |  |
2017 Credit Agreement [member] | Mexico, Pesos |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Amortizing in Four Equal Payments | $ 313.0 |  |  |  |  |  |  |  |
Nominal value of Debt Converted in to Other Currency |  |  |  | $ 313.0 |  |  |  |  |
2014 Credit Agreement [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Bank indebtedness |  |  |  |  |  |  |  | $ 3,680.0 |
Bottom of range [member] | Credit agreement [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 1.65% |  |  |  |  |
Bottom of range [member] | 2017 Credit Agreement [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  | 2023 |  |  |  |  |  |  |
Long Term debt |  |  |  | $ 43.0 |  |  |  |  |
Bottom of range [member] | 2017 Credit Agreement [member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  | 2022 |  |  |  |  |
Bottom of range [member] | 2017 Credit Agreement [member] | Later than six months and not later than one year [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  | 2022 |  |  |  |  |
Top of range [member] | Credit agreement [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.94% |  |  |  |  |
Top of range [member] | 2017 Credit Agreement [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  | 2025 |  |  |  |  |  |  |
Long Term debt |  |  |  | $ 93.0 |  |  |  |  |
Top of range [member] | 2017 Credit Agreement [member] | Later than two years and not later than three years [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  | 2025 |  |  |  |  |
Top of range [member] | 2017 Credit Agreement [member] | Later than six months and not later than one year [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  | 2023 |  |  |  |  |

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