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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill Balances The carrying amount of goodwill attributable to each reportable segment with goodwill balances and the changes in those balances during the fiscal years ended September 30, 2025 and 2024 are as follows:

 

 

Reinforcement
Materials

 

 

Performance
Chemicals

 

 

Total

 

 

 

(In millions)

 

Balance at September 30, 2023

 

$

51

 

 

$

83

 

 

$

134

 

Foreign currency impact

 

 

(3

)

 

 

2

 

 

 

(1

)

Balance at September 30, 2024

 

 

48

 

 

 

85

 

 

 

133

 

Foreign currency impact

 

 

2

 

 

 

(1

)

 

 

1

 

Balance at September 30, 2025

 

$

50

 

 

$

84

 

 

$

134

 

 

 

 

 

 

 

 

 

 

 

 
Schedule of Intangible Assets with Finite Lives

The following table provides information regarding the Company’s intangible assets with finite lives:

 

 

 

September 30, 2025

 

 

September 30, 2024

 

 

 

Gross
Carrying
Value

 

 

Accumulated
Amortization

 

 

Net
Intangible
Assets

 

 

Gross
Carrying
Value

 

 

Accumulated
Amortization

 

 

Net
Intangible
Assets

 

 

 

(In millions)

 

Developed technologies(1)

 

$

41

 

 

$

(14

)

 

$

27

 

 

$

34

 

 

$

(12

)

 

$

22

 

Trademarks

 

 

2

 

 

 

(1

)

 

$

1

 

 

 

2

 

 

 

(1

)

 

 

1

 

Customer relationships

 

 

63

 

 

 

(36

)

 

 

27

 

 

 

60

 

 

 

(30

)

 

 

30

 

Total intangible assets

 

$

106

 

 

$

(51

)

 

$

55

 

 

$

96

 

 

$

(43

)

 

$

53

 

 

(1)
Included within Developed technologies as of September 30, 2025 is $8 million of intangible assets acquired during the first quarter of fiscal 2025 as discussed in Note C above.