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Accumulated Other Comprehensive Income (Loss) ("AOCI") | 9 Months Ended
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Jun. 30, 2025
Stockholders' Equity Note [Abstract] |
Accumulated Other Comprehensive Income (Loss) ("AOCI") | E. Accumulated Other Comprehensive Income (Loss) (“AOCI”) Comprehensive income combines net income (loss) and other comprehensive income items, which are reported as components of stockholders’ equity in the accompanying Consolidated Balance Sheets. Changes in each component of AOCI, net of tax, were as follows:
|  | Currency Translation Adjustment |  |  | Pension and Other Post-retirement Benefit Liability Adjustments |  |  | Total |
|  | (In millions) |
Balance at September 30, 2024, attributable to Cabot Corporation |  | $ | (342 | ) |  | $ | (18 | ) |  | $ | (360 | )
Other comprehensive income (loss) before reclassifications |  |  | (104 | ) |  |  | — |  |  |  | (104 | )
Amounts reclassified from AOCI |  |  | — |  |  |  | — |  |  |  | — |
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | (7 | ) |  |  | — |  |  |  | (7 | )
Balance at December 31, 2024, attributable to Cabot Corporation |  | $ | (439 | ) |  | $ | (18 | ) |  | $ | (457 | )
Other comprehensive income (loss) before reclassifications |  |  | 34 |  |  |  | 1 |  |  |  | 35 |
Amounts reclassified from AOCI |  |  | (1 | ) |  |  | (1 | ) |  |  | (2 | )
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | 3 |  |  |  | — |  |  |  | 3 |
Balance at March 31, 2025, attributable to Cabot Corporation |  | $ | (409 | ) |  | $ | (18 | ) |  | $ | (427 | )
Other comprehensive income (loss) before reclassifications |  |  | 76 |  |  |  | — |  |  |  | 76 |
Amounts reclassified from AOCI |  |  | — |  |  |  | — |  |  |  | — |
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | 4 |  |  |  | — |  |  |  | 4 |
Balance at June 30, 2025, attributable to Cabot Corporation |  | $ | (337 | ) |  | $ | (18 | ) |  | $ | (355 | )
|  | Currency Translation Adjustment |  |  | Pension and Other Post-retirement Benefit Liability Adjustments |  |  | Total |
|  | (In millions) |
Balance at September 30, 2023, attributable to Cabot Corporation |  | $ | (353 | ) |  | $ | (9 | ) |  | $ | (362 | )
Other comprehensive income (loss) before reclassifications |  |  | 62 |  |  |  | — |  |  |  | 62 |
Amounts reclassified from AOCI |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | 4 |  |  |  | — |  |  |  | 4 |
Balance at December 31, 2023, attributable to Cabot Corporation |  | $ | (296 | ) |  | $ | (9 | ) |  | $ | (305 | )
Other comprehensive income (loss) before reclassifications |  |  | (15 | ) |  |  | — |  |  |  | (15 | )
Amounts reclassified from AOCI |  |  | — |  |  |  | (1 | ) |  |  | (1 | )
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | (4 | ) |  |  | — |  |  |  | (4 | )
Balance at March 31, 2024, attributable to Cabot Corporation |  | $ | (307 | ) |  | $ | (10 | ) |  | $ | (317 | )
Other comprehensive income (loss) before reclassifications |  |  | (66 | ) |  |  | — |  |  |  | (66 | )
Amounts reclassified from AOCI |  |  | — |  |  |  | — |  |  |  | — |
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Balance at June 30, 2024, attributable to Cabot Corporation |  | $ | (372 | ) |  | $ | (10 | ) |  | $ | (382 | )
The amounts reclassified out of AOCI and into the Consolidated Statements of Operations in each of the three and nine months ended June 30, 2025 and 2024 are as follows:
|  | Affected Line Item in the Consolidated |  | Three Months Ended June 30 |  |  | Nine Months Ended June 30 |
|  | Statements of Operations |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  |  |  | (In millions) |  |  |  |  |  |  |
Derivatives: net investment hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Gains) losses reclassified to interest expense |  | Interest expense |  | $ | (1 | ) |  | $ | (1 | ) |  | $ | (4 | ) |  | $ | (4 | )
(Gains) losses excluded from effectiveness testing and amortized to interest expense |  | Interest expense |  |  | 1 |  |  |  | 1 |  |  |  | 2 |  |  |  | 2 |
Pension and other postretirement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of actuarial losses and prior service cost (credit) |  | Other income (expense) |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | (1 | )
Total before tax |  |  |  | $ | — |  |  | $ | — |  |  | $ | (3 | ) |  | $ | (3 | )

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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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