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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