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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Changes in Each Component of AOCI, Net of Tax | Changes in each component of AOCI, net of tax, are as follows for fiscal 2025 and 2024:
|  | Currency Translation Adjustment |  |  | Pension and Other Postretirement Benefit Liability Adjustment |  |  | Total |
|  | (In millions) |
Balance at September 30, 2023 attributable to Cabot Corporation |  | $ | (353 | ) |  | $ | (9 | ) |  | $ | (362 | )
Other comprehensive income (loss) before reclassifications |  |  | 18 |  |  |  | (5 | ) |  |  | 13 |
Amounts reclassified from AOCI |  |  | (2 | ) |  |  | (4 | ) |  |  | (6 | )
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | 5 |  |  |  | — |  |  |  | 5 |
Balance at September 30, 2024 attributable to Cabot Corporation |  |  | (342 | ) |  |  | (18 | ) |  |  | (360 | )
Other comprehensive income (loss) before reclassifications |  |  | 30 |  |  |  | (3 | ) |  |  | 27 |
Amounts reclassified from AOCI |  |  | (2 | ) |  |  | 2 |  |  |  | — |
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | 2 |  |  |  | — |  |  |  | 2 |
Balance at September 30, 2025 attributable to Cabot Corporation |  | $ | (316 | ) |  | $ | (19 | ) |  | $ | (335 | )
Amounts Reclassified Out of AOCI | The amounts reclassified out of AOCI and into the Consolidated Statements of Operations for fiscal 2025, 2024 and 2023 are as follows:
|  | Affected Line Item in the Consolidated |  | Years Ended September 30 |
|  | Statements of Operations |  | 2025 |  |  | 2024 |  |  | 2023 |
|  |  |  | (In Millions) |
Derivatives: net investment hedges |  |  |  |  |  |  |  |  |  |  |
(Gains) losses reclassified to interest expense |  | Interest expense |  | $ | (5 | ) |  | $ | (5 | ) |  | $ | (6 | )
(Gains) losses excluded from effectiveness testing and amortized to interest expense |  | Interest expense |  |  | 2 |  |  |  | 2 |  |  |  | 2 |
Pension and other postretirement benefit liability adjustment |  |  |  |  |  |  |  |  |  |  |
Amortization of actuarial losses and prior service cost (credit) |  | Other income (expense) |  |  | 2 |  |  |  | (2 | ) |  |  | (2 | )
Total before tax |  |  |  | $ | (1 | ) |  | $ | (5 | ) |  | $ | (6 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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