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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Sep. 30, 2024
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 2024 and 2023:
|  | Currency Translation Adjustment |  |  | Pension and Other Postretirement Benefit Liability Adjustment |  |  | Total |
|  | (In millions) |
Balance at September 30, 2022 attributable to Cabot Corporation |  | $ | (429 | ) |  | $ | (10 | ) |  | $ | (439 | )
Other comprehensive income (loss) before reclassifications |  |  | 80 |  |  |  | 3 |  |  |  | 83 |
Amounts reclassified from AOCI |  |  | (4 | ) |  |  | (2 | ) |  |  | (6 | )
Less: Other comprehensive income (loss) attributable to noncontrolling interests |  |  | — |  |  |  | — |  |  |  | — |
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 | )
Amounts Reclassified Out of AOCI | The amounts reclassified out of AOCI and into the Consolidated Statements of Operations for fiscal 2024, 2023 and 2022 are as follows:
|  | Affected Line Item in the Consolidated |  | Years Ended September 30 |
|  | Statements of Operations |  | 2024 |  |  | 2023 |  |  | 2022 |
|  |  |  | (In Millions) |
Derivatives: net investment hedges |  |  |  |  |  |  |  |  |  |  |
(Gains) losses reclassified to interest expense |  | Interest expense |  | $ | (5 | ) |  | $ | (6 | ) |  | $ | (6 | )
(Gains) losses excluded from effectiveness testing and amortized to interest expense |  | Interest expense |  |  | 2 |  |  |  | 2 |  |  |  | 2 |
Release of current translation adjustment |  | Loss on sale of business and asset impairment charge |  |  | — |  |  |  | — |  |  |  | 33 |
Pension and other postretirement benefit liability adjustment |  |  |  |  |  |  |  |  |  |  |
Release of actuarial losses and prior service cost (credits) |  | Loss on sale of business and asset impairment charge |  |  | — |  |  |  | — |  |  |  | 2 |
Amortization of actuarial losses and prior service cost (credit) |  | Other income (expense) |  |  | (2 | ) |  |  | (2 | ) |  |  | 1 |
Settlement and curtailment loss (gain) |  | Other income (expense) |  |  | — |  |  |  | — |  |  |  | (1 | )
Total before tax |  |  |  | $ | (5 | ) |  | $ | (6 | ) |  | $ | 31 |

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