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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Gains and (losses) related to recognition of changes in fair values of the derivative instruments |  | $ 39 | $ 1 | $ (17)
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 |  |
Fuel Price Forward Contracts [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Derivative financial instrument, Notional amount |  | 128 | 96 |
Financial liabilities at estimated fair value |  | 5 | 1 |
Gain (loss) due to changes in estimated fair value |  | 7 | (15) | 35
Net Investment Hedges [member] | Forward Contract [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Derivative financial instrument, Notional amount |  | 741 |  |
Net foreign exchange gain (loss) |  |  | 126 | 59
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 |  | $ 1 | $ 2 | 26
Forward contract to be settled in shares |  | 4.7 | 13.9 |
Forward contract settled in cash |  | 9.2 | 6.9 |
Equity Investments [Member] | Forward Contract [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Net foreign exchange gain (loss) |  | $ 53 |  |
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] | Electric Energy [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Financial assets at estimated fair value |  |  |  | $ 11
Borrowings, interest rate |  |  |  | 5.40%
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 |  | 1,000 |  |
Financial liabilities at estimated fair value |  | 44 | $ 35 |
Gain (loss) due to changes in estimated fair value |  | 9 | $ 26 |
Interest Rate Swap Contract [Member] | Loans from banks at floating interest rate [member] | Cemex [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Derivative financial instrument, Notional amount |  | 334 |  |
Financial liabilities at estimated fair value |  | 3 |  |
Gain (loss) due to changes in estimated fair value |  | 3 |  |
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 |  |
Foreign exchange forwards related to forecasted transactions [member] | Electric Energy [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Net foreign exchange loss |  |  |  | $ 6
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 |  |

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