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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
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

)