v3.26.1
Goodwill and Other Intangible Assets - Summary of Goodwill by Reportable Segment (Details)
$ in Millions
 9 Months Ended
Jun. 30, 2026
USD ($)
Goodwill [Roll Forward]  
Balance at beginning of period $ 705 [1]
Currency translation (5)
Balance at end of period 700 [1]
Life Sciences [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 466 [1]
Currency translation (4)
Balance at end of period 462 [1]
Personal Care [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 127 [1]
Currency translation (1)
Balance at end of period 126 [1]
Specialty Additives [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 112 [1]
Currency translation 0
Balance at end of period 112 [1]
Intermediates [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 0 [1]
Currency translation 0
Balance at end of period $ 0 [1]
[1] As of both June 30, 2026 and September 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.