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Financial Instruments - Additional Information - Derivative Financial Instruments (Detail) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2016 shares | Dec. 31, 2018 MXN ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 MXN ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 MXN ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2018 USD ($) | Apr. 05, 2018 shares | Dec. 31, 2017 USD ($) | Mar. 30, 2017 shares | Dec. 31, 2016 USD ($) | Oct. 31, 2016 MXN ($) | Mar. 31, 2016 shares | Mar. 15, 2011 shares
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains and (losses) related to recognition of changes in fair values of the derivative instruments |  | $ 692.0 | $ 38,000,000 | $ 161.0 | $ 9,000,000 | $ 317.0 | $ 17,000,000 |  |  |  |  |  |  |  |
Increase (decrease) through conversion of convertible instruments, equity |  |  |  | 5,729.0 |  |  |  |  |  |  |  |  |  |  |
Call capped transaction subject to antidilution adjustments, Shares | shares |  |  |  |  |  |  |  |  | 750,000,000 |  | 258,000,000 |  |  | 297,000,000 |
Capped call options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets at fair value through profit or loss, mandatorily measured at fair value |  |  |  | 725.0 |  |  |  |  |  | $ 37,000,000 |  | $ 44,000,000 |  |  |
Call capped transaction subject to antidilution adjustments, Shares | shares | 71,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Call capped transaction subject to antidilution adjustments, Shares | shares |  |  |  |  |  | 8.57 | 8.57 |  |  |  |  |  |  |  |
Amount received by CEMEX |  |  |  |  |  |  |  |  |  | 103,000,000 |  |  |  |  |
Percentage amendment of notional amount | 58.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatory Convertible Securities 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) through conversion of convertible instruments, equity |  | 20.0 | 1,000,000 | 393.0 | 20,000,000 |  |  |  |  |  |  |  |  |  |
Financial assets at fair value through profit or loss, mandatorily measured at fair value |  | 391.0 |  | 359.0 |  | $ (545.0) |  | $ 20,000,000 |  | 19,000,000 |  | (29,000,000) |  |  |
American Depositary Shares Maturing on March 2018 [Member] | Capped call options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets at fair value through profit or loss, mandatorily measured at fair value |  |  |  |  |  | $ 818.0 |  |  |  |  |  |  |  |  |
Call capped transaction subject to antidilution adjustments, Shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,000,000
Call capped transaction subject to antidilution adjustments, Shares | shares |  |  |  |  |  | 5.27 | 5.27 |  |  |  |  |  |  |  |
Aggregate premium, Amount |  |  |  |  |  |  | $ 104,000,000 |  |  |  |  |  |  |  |
Fuel Price Forward Contracts [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instrument, Notional amount |  | 2,398.0 |  | 1,415.0 |  |  |  | 122,000,000 |  | 72,000,000 |  |  |  |  |
Financial liabilities at estimated fair value |  | 275.0 |  | 394.0 |  |  |  | 14,000,000 |  | 20,000,000 |  |  |  |  |
Gain (loss) due to changes in estimated fair value |  | (697.0) | (35,000,000) | 76.0 | 4,000,000 | $ 311.0 | 15,000,000 |  |  |  |  |  |  |  |
Net Investment Hedges [member] | Forward Contract [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net foreign exchange gain (loss) |  | $ (1,157.0) | $ (59,000,000) | 110.0 | $ 6,000,000 |  |  |  |  |  |  |  |  |  |
Average contract life of foreign exchange forward program |  | 1 year | 1 year |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 1,250,000,000 |  | 1,250,000,000 |  |  |  |  |
Equity Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instrument, Notional amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 59.5 |  |
Financial assets at fair value through profit or loss |  | $ 436.0 |  | $ (463.0) |  | 30.0 |  | 25,000,000 |  | (24,000,000) |  | 2,000,000 |  |  |
Derivative contracts maturity date |  | 2020-03 | 2020-03 | 2019-03 | 2019-03 |  |  |  |  |  |  |  |  |  |
Forward contract to be settled in shares | shares |  | 20,900,000 | 20,900,000 | 31,500,000 | 31,500,000 |  |  |  |  |  |  |  |  |  |
Forward contract settled in cash | shares |  | 10,600,000 | 10,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swap Contract [Member] | Electric Energy [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instrument, Notional amount |  |  |  |  |  |  |  | 126,000,000 |  | 137,000,000 |  |  |  |  |
Financial assets at fair value through profit or loss |  | $ 114.0 |  | $ 114.0 |  | 112.0 |  | 6,000,000 |  | 6,000,000 |  | $ 6,000,000 |  |  |
Derivative contracts maturity date |  | 2022-09 | 2022-09 |  |  |  |  |  |  |  |  |  |  |  |
Financial assets at estimated fair value |  | $ 216.0 |  | 314.0 |  |  |  | $ 11,000,000 |  | $ 16,000,000 |  |  |  |  |
Borrowings, interest rate |  | 5.40% |  |  |  |  |  | 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 |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |
Derivative contracts maturity date |  | 2023-06 | 2023-06 |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities at estimated fair value |  | $ 373.0 |  |  |  |  |  | $ 19,000,000 |  |  |  |  |  |  |
Gain (loss) due to changes in estimated fair value |  | 364.0 | $ 19,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange forwards related to forecasted transactions [member] | Forward Contract [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net foreign exchange loss |  | $ 21.0 | $ 1,000,000 | $ 337.0 | $ 17,000,000 |  |  |  |  |  |  |  |  |  |
Net foreign exchange gain |  |  |  |  |  | $ 186.0 | $ 10,000,000 |  |  |  |  |  |  |  |

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