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Accumulated Other Comprehensive Income (Loss) | 12 Months Ended
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Sep. 30, 2025
Stockholders' Equity Note [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Note O. Accumulated Other Comprehensive Income (Loss) 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 | )
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 The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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