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Litigation, Claims and Contingencies - Summary of Progression of Insurance Receivable (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance settlement [1] $ 1 $ 2 $ 2 $ 2      
Ashland [Member]              
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance receivable - beginning of year     155 [2] 151 [2] $ 151 [2] $ 150 [2] $ 402
Receivable adjustment (5)   (5) 15 15 16 (3)
Insurance settlement     0 (5) (5) (4) (227)
Amounts collected     (8) (5) (6) (11) (22)
Insurance receivable - end of period [2] 142 156 142 156 155 151 150
Hercules [Member]              
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance receivable - beginning of year     68 63 63 56 77
Receivable adjustment   (14) (14) 5 5 7 1
Insurance settlement     0 0 0 0 (22)
Insurance receivable - end of period $ 54 $ 68 $ 54 $ 68 $ 68 $ 63 $ 56
[1] Activity of $0 denotes value less than $1 million.
[2] Included $15 million and $14 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of June 30, 2018 and September 30, 2017, respectively.