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Goodwill and Other Intangibles - Summary of Goodwill by Reportable Segment (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Goodwill [Roll Forward]        
Balance at beginning of period     $ 2,253,000,000  
Impairment $ 0 $ 0 (530,000,000) $ 0
Currency translation     11,000,000  
Balance at end of period 1,734,000,000   1,734,000,000  
Life Sciences [Member]        
Goodwill [Roll Forward]        
Balance at beginning of period     836,000,000  
Impairment     0  
Currency translation     6,000,000  
Balance at end of period 842,000,000   842,000,000  
Personal Care & Household [Member]        
Goodwill [Roll Forward]        
Balance at beginning of period     355,000,000  
Impairment 0   (356,000,000)  
Currency translation     1,000,000  
Balance at end of period 0   0  
Specialty Additives [Member]        
Goodwill [Roll Forward]        
Balance at beginning of period     609,000,000  
Impairment     (174,000,000)  
Currency translation     4,000,000  
Balance at end of period 439,000,000   439,000,000  
Performance Adhesives [Member]        
Goodwill [Roll Forward]        
Balance at beginning of period     453,000,000  
Impairment     0  
Currency translation     0  
Balance at end of period 453,000,000   453,000,000  
Intermediates and Solvents [Member]        
Goodwill [Roll Forward]        
Balance at beginning of period [1]     0  
Impairment [1]     0  
Currency translation [1]     0  
Balance at end of period [1] $ 0   $ 0  
[1] As of June 30, 2020 and September 30, 2019, there was accumulated impairment of $90 million related to the Intermediates and Solvents reportable segment.