XML 177 R125.htm IDEA: XBRL DOCUMENT
v3.21.1

Financial Instruments - Summary of Consolidated Financial Ratios (Detail) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 4.07% | 4.17% | 3.84%
Coverage Ratio | 3.82% | 3.86% | 4.41%
Less than or Equal to 6.25 Ratio [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 6.25% |  |
Greater than or Equal to 1.75 Ratio [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Coverage Ratio | 1.75% |  |
Less than or Equal to 5.25 Ratio [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio |  | 5.25% |
Greater than or Equal to 2.50 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Coverage Ratio |  | 2.50% | 2.50%
Less than or Equal to 4.75 Ratio [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Leverage Ratio | 4.75% |  | 4.75%

X
- Definition Coverage ratio. + References No definition available. + Details
Name: | cx_CoverageRatio
Namespace Prefix: | cx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Leverage ratio. + References No definition available. + Details
Name: | cx_LeverageRatio
Namespace Prefix: | cx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cx_LessThanOrEqualToSixPointTwoFiveRatiomemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cx_GreaterThanOrEqualToOnePointSevenFiveRatiomemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cx_LessThanOrEqualToFivePointTwoFiveRatioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cx_GreaterThanOrEqualToTwoPointFiveZeroRatioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cx_LessThanOrEqualToFourPointSevenFiveRatioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |