v3.25.2
Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 1,371 $ 1,561
Accumulated amortization (1,071) (1,088)
Net carrying amount 300 473
Intangible Assets, Net [Abstract]    
Gross carrying amount 1,649 1,839
Net carrying amount 578 751
Trademarks and Trade Names [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount [1] 75 87
Accumulated amortization [1] (38) (42)
Net carrying amount [1] 37 45
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]    
Indefinite-lived intangible assets 278 278
Intellectual Property [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount [2] 682 715
Accumulated amortization [2] (630) (613)
Net carrying amount [2] 52 102
Customer and Supplier Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount [3] 614 759
Accumulated amortization [3] (403) (433)
Net carrying amount [3] $ 211 $ 326
[1] Ashland allocated $7 million to the Avoca business during the nine months ended June 30, 2025. See Note B of the Notes to the Condensed Consolidated Financial Statements for additional details.
[2] Ashland allocated $29 million to the Avoca business during the nine months ended June 30, 2025. See Note B of the Notes to the Condensed Consolidated Financial Statements for additional details.
[3] Ashland allocated $98 million to the Avoca business during the nine months ended June 30, 2025. See Note B of the Notes to the Condensed Consolidated Financial Statements for additional details.