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Employee Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Pension Benefits [Member] | U.S. Defined Benefit Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other liabilities | $ (2) | $ (2)
Pension Benefits [Member] | Foreign Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other assets | 31 | 30
Accounts payable and accrued liabilities | (2) | (1)
Other liabilities | (28) | (24)
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accounts payable and accrued liabilities | (2) | (2)
Other liabilities | (11) | (12)
Postretirement Benefits [Member] | Foreign Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accounts payable and accrued liabilities | (1) | (1)
Other liabilities | $ (11) | $ (10)

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- Definition Defined benefit plan other assets for plan benefits. + References No definition available. + Details
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Namespace Prefix: | cbt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Pension and other postretirement defined benefit plans accounts payable and accrued liabilities. + References No definition available. + Details
Name: | cbt_PensionAndOtherPostretirementDefinedBenefitPlansAccountsPayableAndAccruedLiabilities
Namespace Prefix: | cbt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Pension and other postretirement defined benefit plans other liabilities. + References No definition available. + Details
Name: | cbt_PensionAndOtherPostretirementDefinedBenefitPlansOtherLiabilities
Namespace Prefix: | cbt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |