XML 197 R145.htm IDEA: XBRL DOCUMENT
v3.21.1

Pensions and Post-Employment Benefits - Summary of Plan Assets Measured at Estimated Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of fair value of plan assets [line items] |  |  |
Cash | $ 44 | $ 61 |
Investments in corporate bonds | 475 | 400 |
Investments in government bonds | 457 | 540 |
Total fixed-income securities | 976 | 1,001 |
Investment in marketable securities | 430 | 380 |
Other investments and private funds | 288 | 219 |
Total variable-income securities | 718 | 599 |
Total plan assets | 1,694 | 1,600 | $ 1,487
Level 1 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Cash | 44 | 45 |
Investments in corporate bonds | 1 | 4 |
Investments in government bonds | 86 | 90 |
Total fixed-income securities | 131 | 139 |
Investment in marketable securities | 341 | 223 |
Other investments and private funds | 146 | 46 |
Total variable-income securities | 487 | 269 |
Total plan assets | 618 | 408 |
Level 2 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Cash | 0 | 16 |
Investments in corporate bonds | 474 | 396 |
Investments in government bonds | 371 | 450 |
Total fixed-income securities | 845 | 862 |
Investment in marketable securities | 89 | 157 |
Other investments and private funds | 55 | 85 |
Total variable-income securities | 144 | 242 |
Total plan assets | 989 | 1,104 |
Level 3 [Member] |  |  |
Disclosure of fair value of plan assets [line items] |  |  |
Other investments and private funds | 87 | 88 |
Total variable-income securities | 87 | 88 |
Total plan assets | $ 87 | $ 88 |

X
- Definition Corporate Bonds, Amount Contributed to Fair Value of Plan Assets + References No definition available. + Details
Name: | cx_CorporateBondsAmountContributedToFairValueOfPlanAssets
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Defined benefit plan fixed income securities. + References No definition available. + Details
Name: | cx_DefinedBenefitPlanFixedIncomeSecurities
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Defined benefit plan variable income securities. + References No definition available. + Details
Name: | cx_DefinedBenefitPlanVariableIncomeSecurities
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Government Fixed Interest Bonds, Amount Contributed to Fair Value of Plan Assets + References No definition available. + Details
Name: | cx_GovernmentFixedInterestBondsAmountContributedToFairValueOfPlanAssets
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Marketable securities, amount contributed to fair value of plan assets + References No definition available. + Details
Name: | cx_MarketableSecuritiesAmountContributedToFairValueOfPlanAssets
Namespace Prefix: | cx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 142 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_142_a&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_CashAndCashEquivalentsAmountContributedToFairValueOfPlanAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_DisclosureOfFairValueOfPlanAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount investment funds contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]; Investment funds [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 142 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_142_f&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_InvestmentFundsAmountContributedToFairValueOfPlanAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + 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_PlanAssetsAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level1OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level2OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level3OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |