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Business Combinations, Discontinued Operations, Sale of Other Disposal Groups and Selected Financial Information by Reportable Segment and Line of Business - Additional Information (Detail) MT in Millions, $ in Millions |  |  |  |  | 1 Months Ended | 2 Months Ended | 7 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 06, 2020 USD ($) | Jun. 28, 2019 USD ($) | Mar. 29, 2019 USD ($) MT | Sep. 27, 2018 USD ($) | May 31, 2019 USD ($) | Mar. 06, 2020 USD ($) | Aug. 03, 2020 USD ($) | Dec. 31, 2020 USD ($) | Apr. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Aug. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disclosure of operating segments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 37.80% |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 8,506 |  | $ 9,562 | $ 9,912 |  | $ 9,948
Sale of Assets Disposal Group |  |  | $ 387 |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  | 5,352 |  | $ 5,409 |  |  |
Procon Readymix Ltd [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |  |  |  | $ 22 |
Net assets acquired |  |  |  |  |  |  |  | 10 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 12 |  |  |  |  |
Cimentos Vencemos Do Amazonas Ltda [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture |  |  |  | $ 31 |  |  |  |  |  |  |  |  |
Gain (loss) on sale of business |  |  |  | $ 12 |  |  |  |  |  |  |  |  |
Cemex [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 8 |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture |  | 36 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of business |  | $ 17 | $ 66 |  |  |  |  |  |  |  |  |  |
Gunter Papenburg [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture |  |  |  |  | $ 97 |  |  |  |  |  |  |  |
Gain (loss) on sale of business |  |  |  |  | $ 59 |  |  |  |  |  |  |  |
Breedon Group Plc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 47 |  |  |  |  |
Gain (loss) on sale of business |  |  |  |  |  |  | $ 57 | 230 |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  | 30 |  |  |  |  |
Kosoms [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership percentage acquired | 75.00% |  |  |  |  | 75.00% |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 291 |  |  |  |  |
Proceeds from divestiture | $ 499 |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of business | $ 665 |  |  |  |  | $ 14 |  |  |  |  |  |  |
Estonia |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual production capacity of cement plant sold | MT |  |  | 1.8 |  |  |  |  |  |  |  |  |  |
Israel [member] | Readymix Business Netei Noy [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  | $ 33 |  |  |  |
Net assets acquired |  |  |  |  |  |  |  |  | 33 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 2 |  |  |  |
Schwenk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Annual production capacity of cement plant sold | MT |  |  | 1.7 |  |  |  |  |  |  |  |  |  |
Cimsa Cimento Sanayi Ve Ticaret AS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture |  |  | $ 180 |  |  |  |  |  |  |  |  |  |

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