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Financial Instruments - Summary of Long Term Notes Payable (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items] |  |
3-Month LIBOR rate | 1.9084% | 0.23838%
3-Month EURIBOR rate | 0.383% | 0.545%
28-Day TIIE Rate |  | 4.4805%
CEMEX SAB de CV November 2029 Notes [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Repurchased of Notes Amount | $ 360 |

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