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The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

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The net gain arising from exchange differences recognised in profit or loss, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Foreign exchange gain (loss)]

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The net loss arising from exchange differences recognised in profit or loss, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Foreign exchange gain (loss)]

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The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

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Financial Instruments - Additional Information - Derivative Financial Instruments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 30, 2024
Disclosure of detailed information about financial instruments [line items]
Gains and (losses) related to recognition of changes in fair values of the derivative instruments	$ (2)	$ (19)	$ (5)
Currency swap contract [member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount		335			$ 658
Gain (loss) due to changes in estimated fair value	(123)	23
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 gain			70
Changes in the fair value of these instruments			8
Debt Instrument Settlement Gains			80
Foreign Exchange Options [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	$ 650	300
Financial Income And Other Items [Member] \| Peso Denominated Value [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative contracts maturity date	January 2026
Financial Income And Other Items [Member] \| Foreign Exchange Options [Member]
Disclosure of detailed information about financial instruments [line items]
Changes in the fair value of these instruments	$ 15	(18)	(13)
Financial Income And Other Items [Member] \| Foreign Exchange Options [Member] \| Peso Denominated Value [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative contracts maturity date	October 2026
Loans from banks at floating interest rate [member] \| Finance Expense [Member] \| Currency swap contract [member]
Disclosure of detailed information about financial instruments [line items]
Reclassification adjustments on cash flow hedges, net of tax	$ 28	5
Fuel Price Forward Contracts [member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	134	110
Financial liabilities at estimated fair value	1	1
Gain (loss) due to changes in estimated fair value	6	6		$ 25
Fuel Price Forward Contracts [member] \| Operating Expense [Member]
Disclosure of detailed information about financial instruments [line items]
Reclassification adjustments on cash flow hedges, net of tax	5	7	88
Fuel Price Forward Contracts [member] \| Financial Income And Other Items [Member]
Disclosure of detailed information about financial instruments [line items]
Changes in the fair value of these instruments	(8)	(1)
Fuel Price Forward Contracts [member] \| Cemex Brent Oil [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	150	122
Fuel Price Forward Contracts [member] \| Cemex Held Coal [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	72
Changes in the fair value of these instruments	(9)
Foreign exchange forwards hedging the net investment [member] \| Forward Contract [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	492	518
Net foreign exchange gain (loss)	(86)	172	96
Foreign exchange forwards hedging the net investment [member] \| Capped Forwards With Option Contracts [Member] \| Peso Denominated Value [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount	221	458
Net foreign exchange loss		54	2
Net foreign exchange gain	$ 43
Foreign exchange forwards hedging the net investment [member] \| Top of range [member] \| Forward Contract [Member] \| Peso Denominated Value [Member]
Disclosure of detailed information about financial instruments [line items]
BorrowingsMaturityPeriod	15 months
Foreign exchange forwards hedging the net investment [member] \| Bottom of range [member] \| Forward Contract [Member] \| Peso Denominated Value [Member]
Disclosure of detailed information about financial instruments [line items]
BorrowingsMaturityPeriod	1 month
Interest Rate Swap Contract [Member] \| Finance Expense [Member] \| Peso Floating Rates [Member]
Disclosure of detailed information about financial instruments [line items]
Reclassification adjustments on cash flow hedges, net of tax		18	7
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	$ 600	750
Gain (loss) due to changes in estimated fair value	16	9	69
Reclassification adjustments on cash flow hedges, net of tax	14	30
Interest Rate Swap Contract [Member] \| Loans from banks at floating interest rate [member] \| Peso Floating Rates [Member]
Disclosure of detailed information about financial instruments [line items]
Gain (loss) due to changes in estimated fair value	$ (15)	3
Interest Rate Swap Contract [Member] \| Loans from banks at floating interest rate [member] \| Finance Expense [Member]
Disclosure of detailed information about financial instruments [line items]
Reclassification adjustments on cash flow hedges, net of tax		22
Interest Rate Swaps [member] \| Mexican Peso Floating Rates [member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial instrument, Notional amount			268
Financial assets at estimated fair value			15
Interest Rate Swaps [member] \| Loans from banks at floating interest rate [member] \| Finance Expense [Member]
Disclosure of detailed information about financial instruments [line items]
Reclassification adjustments on cash flow hedges, net of tax		$ 2	$ 23