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Litigation, Claims and Contingencies - Summary of Progression of Insurance Receivable (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]            
Insurance settlement [1] $ 1   $ 0      
Ashland [Member]            
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]            
Insurance receivable - beginning of year 140 [2]   155 [2] $ 155 [2] $ 151 [2] $ 150
Receivable adjustment 0 $ (5) 0 (5) 15 16
Insurance settlement 0   0 0 (5) (4)
Amounts collected (1)   (4) (10) (6) (11)
Insurance receivable - end of period [2] 139   151 140 155 151
Hercules [Member]            
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]            
Insurance receivable - beginning of year 54   68 68 63 56
Receivable adjustment 0 $ (14) 0 (14) 5 7
Insurance receivable - end of period $ 54   $ 68 $ 54 $ 68 $ 63
[1] Activity of $0 denotes value less than $1 million.
[2] Included $15 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of both December 31, 2018 and September 30, 2018