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Goodwill and Other Intangibles - Summary of Goodwill by Reportable Segment (Details)
$ in Millions
 9 Months Ended
Jun. 30, 2018
USD ($)
Goodwill [Roll Forward]  
Balance at beginning of period $ 2,465
Acquisitions 7 [1]
Currency translation (25)
Balance at end of period 2,447
Specialty Ingredients [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 2,315
Acquisitions 7 [1]
Currency translation (19)
Balance at end of period 2,303
Composites [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 150
Acquisitions 0 [1]
Currency translation (6)
Balance at end of period 144
Intermediates and Solvents [Member]  
Goodwill [Roll Forward]  
Balance at beginning of period 0 [2]
Acquisitions 0 [1],[2]
Currency translation 0 [2]
Balance at end of period $ 0 [2]
[1] Relates to the acquisition of Vornia Limited and subsequent adjustments to the initial purchase price of Pharmachem during the nine months ended June 30, 2018. See Note C for more information.
[2] As of June 30, 2018 and September 30, 2017, there was accumulated impairment of $171 million related to the Intermediates and Solvents reportable segment.