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Financial Instruments - Additional Information - Other Financial Obligations (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 13, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Leases |  | $ 350 | $ 316 | $ 266 |
Debt Repayments |  | $ 4,572 | $ 3,284 | $ 2,745 |
CEMEX SAB De CV2020 Convertible Notes [Member] | Cemex [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Debt Repayments | $ 521 |  |  |  |
Convertible Subordinated Notes Due 2020 [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Debt principal amount |  |  |  |  | $ 521
Debt interest percentage |  |  |  |  | 3.72%
Conversion price |  | $ 10.73 |  |  |

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