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Stockholders' Equity - Detail of Cemex's Perpetual Debentures, Excluding Perpetual Debentures Held by Subsidiaries (Detail) | 12 Months Ended |  |
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Dec. 31, 2020 USD ($) Anniversaries | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€)
EURIBOR [member] | C10-EUR Capital (SPV) Ltd [Member] |  |  |  |
Disclosure of Perpetual Debentures [Line Items] |  |  |  |
Issuance date | 2007-05 |  |  |
Nominal amount | € |  | € 64,000,000 |  | € 64,000,000
Repurchase option | 10 |  |  |
Interest rate | 4.79% | 4.79% |  |
LIBOR [Member] | C8 Capital (SPV) Ltd [Member] |  |  |  |
Disclosure of Perpetual Debentures [Line Items] |  |  |  |
Issuance date | 2007-02 |  |  |
Nominal amount | $ | $ 135,000,000 |  | $ 135,000,000 |
Repurchase option | 8 |  |  |
Interest rate | 4.40% | 4.40% |  |
LIBOR [Member] | C5 Capital (SPV) Ltd [Member] |  |  |  |
Disclosure of Perpetual Debentures [Line Items] |  |  |  |
Issuance date | 2006-12 |  |  |
Nominal amount | $ | $ 61,000,000 |  | 61,000,000 |
Repurchase option | 5 |  |  |
Interest rate | 4.277% | 4.277% |  |
LIBOR [Member] | C10 Capital (SPV) Ltd [Member] |  |  |  |
Disclosure of Perpetual Debentures [Line Items] |  |  |  |
Issuance date | 2006-12 |  |  |
Nominal amount | $ | $ 175,000,000 |  | $ 175,000,000 |
Repurchase option | 10 |  |  |
Interest rate | 4.71% | 4.71% |  |

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