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Goodwill and Other Intangibles - Summary of Goodwill by Reportable Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Goodwill [Roll Forward]    
Balance at beginning of period $ 2,304 $ 2,315
Acquisition [1]   5
Currency translation (51) (16)
Balance at end of period 2,253 2,304
Specialty Ingredients [Member]    
Goodwill [Roll Forward]    
Balance at beginning of period 2,304 2,315
Acquisition [1]   5
Currency translation (51) (16)
Balance at end of period 2,253 2,304
Intermediates and Solvents [Member]    
Goodwill [Roll Forward]    
Balance at beginning of period [2] 0 0
Acquisition [1],[2]   0
Currency translation [2] 0 0
Balance at end of period [2] $ 0 $ 0
[1] Relates to the acquisition of Pharmachem during 2017 and Vornia Limited during 2018. See Note C for more information.
[2] As of September 30, 2019 and 2018, there was accumulated impairment of $90 million related to the Intermediates and Solvents reportable segment.