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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, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]            
Insurance settlement [1] $ 0   $ 1      
Ashland [Member]            
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]            
Insurance receivable - beginning of year 123 [2]   140 [2] $ 140 [2] $ 155 [2] $ 151
Receivable adjustment 0 $ (5) 0 (5) (5) 15
Insurance settlement 0   0 0 0 (5)
Amounts collected (1)   (1) (12) (10) (6)
Insurance receivable - end of period [2] 122   139 123 140 155
Hercules [Member]            
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]            
Insurance receivable - beginning of year 49   54 54 68 63
Receivable adjustment 0 $ (5) 0 (5) (14) 5
Insurance receivable - end of period $ 49   $ 54 $ 49 $ 54 $ 68
[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, 2019 and September 30, 2019