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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Parenthetical) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Ashland [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve $ 360 [1] $ 380 [1] $ 385 [1] $ 419 [1] $ 415 [1] $ 409
Ashland [Member] | Other Current Liabilities [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve 28 30        
Hercules [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve 257 [2] 282 [2] $ 289 [2] $ 323 [2] $ 321 [2] $ 311
Hercules [Member] | Other Current Liabilities [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve $ 13 $ 20        
[1] Includes $28 million and $30 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of June 30, 2019 and September 30, 2018, respectively.
[2] Included $13 million and $20 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of June 30, 2019 and September 30, 2018, respectively.