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Financial Instruments - Additional Information - Derivative Financial Instruments (Detail) - USD ($) shares in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 30, 2021
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gains and (losses) related to recognition of changes in fair values of the derivative instruments |  | $ (6) | $ (17) | $ (1) |
Mexican Peso Floating Rates [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) due to changes in estimated fair value |  | 15 | (3) |  |
Payments on Contract |  | 3 |  |  |
Currency swap contract [member] | Euro denominated [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Derivative financial instrument, Notional amount |  | 750 |  |  |
Net foreign exchange loss |  | 1 |  |  |
Net foreign exchange gain |  | 10 |  |  |
Foreign Exchange Options [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Derivative financial instrument, Notional amount |  | $ 250 |  |  |
Financial Income And Other Items [Member] | CEMEX SAB De CV April 2024 Notes [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) due to changes in estimated fair value |  |  | 3 |  |
Financial Income And Other Items [Member] | Foreign Exchange Options [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Derivative contracts maturity date |  | September 2022 |  |  |
Changes in the fair value of these instruments |  | $ 5 |  |  |
Fuel Price Forward Contracts [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Derivative financial instrument, Notional amount |  | 145 | 128 |  |
Financial liabilities at estimated fair value |  | 30 | 5 |  |
Gain (loss) due to changes in estimated fair value |  | 22 | 7 | 15 |
Net Investment Hedges [member] | Forward Contract [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Derivative financial instrument, Notional amount |  | 761 | 741 |  |
Net foreign exchange gain (loss) |  |  | 53 | (126) |
Net foreign exchange loss |  | 4 |  |  |
Net Investment Hedges [member] | Top of range [member] | Forward Contract [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Derivative financial instrument, Notional amount |  | 1,250 |  |  |
Equity Investments [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Financial assets at fair value through profit or loss |  | 2 | $ 1 | $ 2 |
Forward contract to be settled in shares |  |  | 4.7 |  |
Forward contract settled in cash |  |  | 9.2 | 6.9 |
Interest Rate Swap Contract [Member] | Cemex [Member] | Financial Income And Other Items [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Payments on Contract | $ 14 |  |  |  |
Interest Rate Swap Contract [Member] | Top of range [member] | Cemex [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings, interest rate | 3.05% |  |  |  |
Interest Rate Swap Contract [Member] | Bottom of range [member] | Cemex [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings, interest rate | 2.56% |  |  |  |
Interest Rate Swap Contract [Member] | Loans from banks at floating interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Derivative financial instrument, Notional amount |  | 750 | $ 1,000 |  |
Financial assets at fair value through profit or loss |  |  |  |  | $ 5
Financial liabilities at estimated fair value |  | 30 | 44 |  |
Gain (loss) due to changes in estimated fair value |  | 23 | 9 |  |
Foreign exchange forwards related to forecasted transactions [member] | 2017 Credit Agreement [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Derivative financial instrument, Notional amount |  |  | 397 |  |
Foreign exchange forwards related to forecasted transactions [member] | Financial Income And Other Items [Member] | 2017 Credit Agreement [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Net foreign exchange gain (loss) |  |  | $ 15 |  |
DollarEuro Foreign Exchange Forward Contracts [Member] | April 2024 Notes [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings, interest rate |  |  | 4.625% |  |
British PoundEuro Foreign Exchange Forward Contracts [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Derivative financial instrument, Notional amount |  |  | $ 186 |  |
British PoundEuro Foreign Exchange Forward Contracts [Member] | Financial Income And Other Items [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) due to changes in estimated fair value |  |  | 9 |  |
Interest Rate Swaps [member] | Mexican Peso Floating Rates [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Derivative financial instrument, Notional amount |  | 255 | 334 |  |
Financial liabilities at estimated fair value |  |  | $ 3 |  |
Financial assets at estimated fair value |  | $ 12 |  |  |

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