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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Parenthetical) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Ashland [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve $ 341 [1] $ 352 [1] $ 360 $ 380 $ 419 $ 415
Ashland [Member] | Other Current Liabilities [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve 29 28        
Hercules [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve 235 [2] 252 [2] $ 257 $ 282 $ 323 $ 321
Hercules [Member] | Other Current Liabilities [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve $ 22 $ 21        
[1] Included $29 million and $28 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both June 30, 2020 and September 30, 2019.
[2] Included $22 million and $21 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both June 30, 2020 and September 30, 2019.