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Financial Instruments - Additional Information - Credit Agreement, Facilities Agreement and Financing Agreement (Detail) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 29, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017 | Jul. 19, 2017
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Repayments of current borrowings |  | $ 5,897 | $ 4,572 | $ 3,284 |  |
3-Month LIBOR rate |  | 0.21% | 0.24% |  |  |
3-Month EURIBOR rate |  | (0.57%) | (0.545%) |  |  |
28-Day TIIE Rate |  | 5.72% |  |  |  |
Total adjustment of the interest rate margin description |  | interest rate margin of plus or minus 5 basis points |  |  |  |
Two Thousand Twenty One Credit Agreement [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Repayments of current borrowings | $ 3,250 |  |  |  |  |
Line of credit ,Maximum Amount |  | $ 600 |  |  |  |
Line of credit ,Interest basis Points |  | 25 days |  |  |  |
Line of credit Leverage Ratio Description |  | 2.25 times in the lower end to greater than 3.25 times |  |  |  |
Two Thousand Twenty One Credit Agreement [Member] | Five year amortizing term loan [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Line of credit ,Maximum Amount | 1,500 |  |  |  |  |
Line of credit ,Expiration period |  | 5 years |  |  |  |
Two Thousand Twenty One Credit Agreement [Member] | Five year committed Revolving Credit Facility [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Line of credit ,Maximum Amount | $ 1,750 |  |  |  |  |
Line of credit ,Expiration period |  | 5 years |  |  |  |
CEMEX Holdings Philippines, Inc. [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Maximum capital expenditure |  | $ 500 | $ 500 |  |  |
CEMEX Latam Holdings, S.A [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Maximum capital expenditure |  | 1,500 | 1,500 |  |  |
Acquisitions and investments in joint ventures |  | $ 400 | $ 400 |  |  |
2017 Credit Agreement [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Bank indebtedness |  |  |  |  |  | $ 4,050
2014 Credit Agreement [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Bank indebtedness |  |  |  |  | $ 3,680 |
Bottom of range [member] | Two Thousand Twenty One Credit Agreement [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Line of credit ,Interest basis Points |  | 100 days |  |  |  |
Bottom of range [member] | Credit agreement [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Interest rate |  | 1.65% |  |  |  |
Top of range [member] | Two Thousand Twenty One Credit Agreement [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Line of credit ,Interest basis Points |  | 175 days |  |  |  |
Top of range [member] | Credit agreement [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Interest rate |  | 3.94% |  |  |  |

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