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Goodwill and Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Risk free rate |  |  | 2.20% | 2.90% |
Increase in pre-tax discount rate |  |  | 1.00% |  |
Decrease in long-term growth rate |  |  | 1.00% |  |
Weighted average Operating EBITDA multiple |  |  | 11.5 | 11.5 | 11.1
Discount rates |  | 7.80% | 7.80% | 7.70% |
Impairment of finite lived intangible assets |  |  | $ 194 |  | $ 9
Cash flow projection period |  |  | 7 years | 5 years |
Growth rate for cash flow projections |  | 2.50% | 2.50% | 2.00% |
Percentage of reduction in value in use of goodwill |  |  | 25.70% |  |
Discount rates |  | 7.80% | 7.80% | 7.70% |
Market risk premium percentage |  |  | 5.70% | 5.60% |
Stock volatility factor |  |  | 1.19 | 1.08 |
Decrease Of Two Years In Cash Flow Projections [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Percentage Allocation In Respect Of Reduction In Value Of Goodwill |  |  | 51.50% |  |
Reduction In The Long Term Growth Rate [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Percentage Allocation In Respect Of Reduction In Value Of Goodwill |  |  | 27.30% |  |
Reduction In Sales Growth [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Percentage Allocation In Respect Of Reduction In Value Of Goodwill |  |  | 28.30% |  |
Reduction In Discount Rate [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Percentage Allocation In Respect Of Reduction In Value Of Goodwill |  |  | 7.10% |  |
Operating segments [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Weighted average Operating EBITDA multiple |  |  | 11.5 |  |
Others intangible assets [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment of finite lived intangible assets | [1] |  | $ 13 |  |
Cemex [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Funding cost percentage |  |  | 4.10% | 5.40% | 7.30%
Risk free rate |  |  |  | 2.90% |
Discount rates |  | 0.10% | 0.10% | 1.50% |
Decrease In Weighing Of Debt Percentage |  |  | 34.60% | 31.70% | 33.50%
Discount rates |  | 0.10% | 0.10% | 1.50% |
Cemex [Member] | Operating segments [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Discount rates |  |  |  | 0.60% | 2.60%
Discount rates |  |  |  | 0.60% | 2.60%
Top of range [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Funding cost percentage |  |  | 4.10% |  |
Risk free rate |  |  | 2.30% |  |
Top of range [member] | Cemex [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Decription Of Stock Volatility Rate Increase |  |  |  | 1.08% |
Bottom of range [member] | Cemex [Member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Decription Of Stock Volatility Rate Increase |  |  |  |  | 1.06%
United States [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Percentage of goodwill allocated |  |  | 76.00% | 78.00% |
Discount rates |  | 7.30% | 7.30% | 7.80% | 8.50%
Impairment of finite lived intangible assets |  |  | $ 181 |  |
Growth rate for cash flow projections |  | 2.00% | 2.00% | 2.50% |
Discount rates |  | 7.30% | 7.30% | 7.80% | 8.50%
Percentage reduction in long term growth rate |  |  | 0.50% |  |
United States [member] | Operating segments [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Discount rates |  | 1.00% | 1.00% |  |
Growth rate for cash flow projections |  | 1.00% | 1.00% |  |
Discount rates |  | 1.00% | 1.00% |  |
United States [member] | Goodwill [member] | Operating segments [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Impairment of finite lived intangible assets |  | $ 1,020 |  |  |
Mexico [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Discount rates |  | 8.30% | 8.30% | 9.00% | 9.40%
Growth rate for cash flow projections |  | 1.10% | 1.10% | 2.40% | 3.00%
Discount rates |  | 8.30% | 8.30% | 9.00% | 9.40%
Percentage reduction in long term growth rate |  |  | 1.30% |  |
Colombia [member] |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Discount rates |  | 8.40% | 8.40% | 8.90% | 9.50%
Growth rate for cash flow projections |  | 2.50% | 2.50% | 3.70% | 3.60%
Discount rates |  | 8.40% | 8.40% | 8.90% | 9.50%
Percentage reduction in long term growth rate |  |  | 1.20% |  |
[1] | In 2020 and 2019, “Others” includes the carrying amount of internal-use software of $213 and $253, respectively. Capitalized direct costs incurred in the development stage of internal-use software, such as professional fees, direct labor and related travel expenses amounted to $40 in 2020, $102 in 2019 and $133 in 2018.

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