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Goodwill and Intangible Assets, Net - Summary of Goodwill Balances Allocated by Operating Segment (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |  |
Goodwill |  | $ 8,506 | $ 9,562 | $ 9,912 | $ 9,948
Mexico [member] |  |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |  |
Goodwill |  | 372 | 384 |  |
United States [member] |  |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |  |
Goodwill |  | 6,449 | 7,469 |  |
Spain [member] |  |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |  |
Goodwill |  | 463 | 494 |  |
United Kingdom [member] |  |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |  |
Goodwill |  | 292 | 279 |  |
France [member] |  |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |  |
Goodwill |  | 229 | 221 |  |
Rest of EMEAA [member] |  |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |  |
Goodwill | [1] | 44 | 42 |  |
Colombia [member] |  |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |  |
Goodwill |  | 283 | 296 |  |
Caribbean TCL [member] |  |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |  |
Goodwill |  | 92 | 100 |  |
Rest of South, Central America and the Caribbean [member] |  |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |  |
Goodwill | [2] | 64 | 62 |  |
Philippines [member] |  |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |  |
Goodwill |  | 95 | 92 |  |
United Arab Emirates [member] |  |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |  |
Goodwill |  | 96 | 96 |  |
Other countries [member] |  |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |  |
Goodwill | [3] | $ 27 | $ 27 |  |
[1] | This caption refers to the operating segments in the Czech Republic and Egypt.
[2] | This caption refers to the operating segments in the Dominican Republic, the Caribbean, Costa Rica and Panama.
[3] | This caption is primarily associated with Neoris N.V., CEMEX’s subsidiary involved in the sale of information technology and services.

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