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Goodwill and Other Intangibles - Summary of Goodwill by Reportable Segment (Details)
$ in Millions
 6 Months Ended
Mar. 31, 2022
USD ($)
Goodwill [Roll Forward]  
Balance at beginning of period $ 1,430
Currency translation (26)
Balance at end of period 1,404
Life Sciences [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 856
Currency translation (16)
Balance at end of period 840
Personal Care [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 129 [1]
Currency translation (3) [1]
Balance at end of period 126 [1]
Specialty Additives [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 445 [1]
Currency translation (7) [1]
Balance at end of period 438 [1]
Intermediates [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 0 [1]
Currency translation 0 [1]
Balance at end of period $ 0 [1]
[1] As of March 31, 2022 and September 30, 2021, there were accumulated impairments of $356 million, $174 million and $90 million related to the Personal Care, Specialty Additives and Intermediates reportable segments, respectively.