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Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Sep. 30, 2024
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 1,328 $ 1,561
Accumulated amortization (1,026) (1,088)
Net carrying amount 302 473
Intangible Assets, Net [Abstract]    
Gross carrying amount 1,606 1,839
Net carrying amount 580 751
Trademarks and Trade Names [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount [1] 72 87
Accumulated amortization [1] (37) (42)
Net carrying amount [1] 35 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] 666 715
Accumulated amortization [2] (609) (613)
Net carrying amount [2] 57 102
Customer and Supplier Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount [3] 590 759
Accumulated amortization [3] (380) (433)
Net carrying amount [3] $ 210 $ 326
[1] Ashland allocated $7 million to the Avoca business during the six months ended March 31, 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 six months ended March 31, 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 six months ended March 31, 2025. See Note B of the Notes to the Condensed Consolidated Financial Statements for additional details.