XML 193 R141.htm IDEA: XBRL DOCUMENT
v3.21.1

Pensions and Post-Employment Benefits - Additional Information (Detail) £ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 GBP (£) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2012 USD ($)
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |
Costs of defined contribution plans | $ 48 |  | $ 50 |  | $ 45 |  |
Projected benefits obligation | 3,033 |  | 2,738 |  | 2,454 |  |
increase in the net projected liability | 10 |  | 10 |  | 22 |  |
Curtailment gain loss on settlement | $ 1 |  | 3 |  |  |  |
Period of settlement of one time settlement obligation | 20 years | 20 years |  |  |  |  |
Post employment healthcare benefits [member] |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |
Projected benefits obligation | $ 78 |  | $ 62 |  |  |  |
Trinidad Cement Limited [member] |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |
Medical inflation rates used to determine the projected benefits obligation | 5.00% |  | 8.00% |  |  |  |
Mexico [member] |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |
Projected benefits obligation | $ 216 |  | $ 203 |  |  |  |
Medical inflation rates used to determine the projected benefits obligation | 8.00% |  | 8.00% |  |  |  |
Income from prior period adjustment of retirement benefit | $ 1 |  |  |  |  |  |
Puerto Rico [member] |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |
Medical inflation rates used to determine the projected benefits obligation | 6.40% |  | 6.30% |  |  |  |
United Kingdom [member] |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |
Projected benefits obligation | $ 1,925 |  | $ 1,681 |  |  |  |
Medical inflation rates used to determine the projected benefits obligation | 6.50% |  | 6.50% |  |  |  |
United States [member] |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |
Projected benefits obligation | $ 305 |  | $ 297 |  |  |  |
United States [member] | Transition to defined contribution plan [member] |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |
One time settlement obligation incurred due to transition of contribution plans | 24 |  |  |  |  |  |
United States And United Kingdom [member] | Multi-employer defined benefit plans [member] |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |
Contribution to the multiemployer plans combined amounts | 56 |  | 64 |  | 65 |  |
Estimate of contribution to be made to the plan in the subsequent annual period | 58 |  |  |  |  |  |
France [member] |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |
Income from prior period adjustment of retirement benefit | 2 |  |  |  |  |  |
CEMEX U.K. [member] |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |
Operating assets |  |  |  |  |  |  | $ 553
Dividends received | $ 29 | £ 21.3 | $ 27 | £ 20.3 | $ 25 | £ 19.3 |
Percentage of annual rate | 5.00% | 5.00% |  |  |  |  |
increase in the net projected liability | $ 54 |  |  |  |  |  |

X
- Definition Defined contribution cost. + References No definition available. + Details
Name: | cx_DefinedContributionCost
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Income from prior period adjustment of retirement benefit. + References No definition available. + Details
Name: | cx_IncomeFromPriorPeriodAdjustmentOfRetirementBenefit
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition One time settlement obligations incurred due to ransition from one plan to the other. + References No definition available. + Details
Name: | cx_OneTimeSettlementObligationsIncurredDueToTransitionFromOnePlanToTheOther
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Operating assets. + References No definition available. + Details
Name: | cx_OperatingAssets
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of annual rate. + References No definition available. + Details
Name: | cx_PercentageOfAnnualRate
Namespace Prefix: | cx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of settlement of one time settlement obligation. + References No definition available. + Details
Name: | cx_PeriodOfSettlementOfOneTimeSettlementObligation
Namespace Prefix: | cx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Medical cost trend rate used as significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ActuarialAssumptionOfMedicalCostTrendRates
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_f&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ContributionsToPlanNetDefinedBenefitLiabilityAsset
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_DefinedBenefitObligationAtPresentValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_DisclosureOfDefinedBenefitPlansLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of dividends received. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B12 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B12_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
Name: | ifrs-full_DividendsReceived
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_147_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_EstimateOfContributionsExpectedToBePaidToPlan
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The gains (losses) on settlements of litigation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 98 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_f&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_GainsLossesOnLitigationSettlements
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in the net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_IncreaseDecreaseInNetDefinedBenefitLiabilityAsset
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cx_PostEmploymentHealthcareBenefitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=cx_TrinidadCementLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_MX
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_PR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cx_TransitionToDefinedContributionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=cx_UnitedStatesAndUnitedKingdomMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=ifrs-full_MultiemployerDefinedBenefitPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_FR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=cx_CEMEXUKMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |