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Accumulated Other Comprehensive Income (Loss) ("AOCI") (Tables) | 9 Months Ended
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Jun. 30, 2026
Equity [Abstract] |
Changes in Each Component of AOCI, Net of Tax | 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, 2025, attributable to Cabot Corporation |  | $ | (316 | ) |  | $ | (19 | ) |  | $ | (335 | )
Other comprehensive income (loss) before reclassifications |  |  | 26 |  |  |  | 3 |  |  |  | 29 |
Amounts reclassified from AOCI |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | 3 |  |  |  | — |  |  |  | 3 |
Balance at December 31, 2025, attributable to Cabot Corporation |  | $ | (294 | ) |  | $ | (16 | ) |  | $ | (310 | )
Other comprehensive income (loss) before reclassifications |  |  | (6 | ) |  |  | — |  |  |  | (6 | )
Amounts reclassified from AOCI |  |  | — |  |  |  | — |  |  |  | — |
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | — |  |  |  | — |  |  |  | — |
Balance at March 31, 2026, attributable to Cabot Corporation |  | $ | (300 | ) |  | $ | (16 | ) |  | $ | (316 | )
Other comprehensive income (loss) before reclassifications |  |  | 32 |  |  |  | (3 | ) |  |  | 29 |
Amounts reclassified from AOCI |  |  | (1 | ) |  |  | 23 |  |  |  | 22 |
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | 2 |  |  |  | — |  |  |  | 2 |
Balance at June 30, 2026, attributable to Cabot Corporation |  | $ | (271 | ) |  | $ | 4 |  |  | $ | (267 | )
|  | 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 | )
Amounts Reclassified Out of AOCI | The amounts reclassified out of AOCI and into the Consolidated Statements of Operations in each of the three and nine months ended June 30, 2026 and 2025 are as follows:
|  | Affected Line Item in the Consolidated |  | Three Months Ended June 30 |  |  | Nine Months Ended June 30 |
|  | Statements of Operations |  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
|  |  |  | (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 |
Pension and other postretirement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement loss |  | Other income (expense) |  |  | 29 |  |  |  | — |  |  |  | 29 |  |  |  | — |
Amortization of actuarial losses and prior service cost (credit) |  | Other income (expense) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1 | )
Total before tax |  |  |  | $ | 28 |  |  | $ | — |  |  | $ | 26 |  |  | $ | (3 | )

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