v3.25.2
Goodwill and Other Intangible Assets - Summary of Goodwill by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Goodwill [Roll Forward]        
Balance at beginning of period     $ 1,381  
Impairment $ (706) $ 0 (706) $ 0
Currency translation     31  
Avoca business - divestiture [1]     (1)  
Balance at end of period 705   705  
Life Sciences [Member]        
Goodwill [Roll Forward]        
Balance at beginning of period     822  
Impairment (375)   (375)  
Currency translation     19  
Avoca business - divestiture [1]     0  
Balance at end of period 466   466  
Personal Care [Member]        
Goodwill [Roll Forward]        
Balance at beginning of period [2]     125  
Impairment     0  
Currency translation [2]     3  
Avoca business - divestiture [1],[2]     (1)  
Balance at end of period [2] 127   127  
Specialty Additives [Member]        
Goodwill [Roll Forward]        
Balance at beginning of period [2]     434  
Impairment (331)   (331)  
Currency translation [2]     9  
Avoca business - divestiture [1],[2]     0  
Balance at end of period [2] 112   112  
Intermediates [Member]        
Goodwill [Roll Forward]        
Balance at beginning of period [2]     0  
Impairment     0  
Currency translation [2]     0  
Avoca business - divestiture [1],[2]     0  
Balance at end of period [2] $ 0   $ 0  
[1] Ashland allocated $1 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 more information.
(c)
As of June 30, 2025, there were accumulated impairments of $375 million, $356 million, $505 million and $90 million related to the Life Sciences, Personal Care, Specialty Additives and Intermediates reportable segments, respectively.
[2] As of September 30, 2024, there were accumulated impairments of zero, $356 million, $174 million and $90 million related to the Life Sciences, Personal Care, Specialty Additives and Intermediates reportable segments, respectively.