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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Parenthetical) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Ashland [Member]        
Asbestos claims [Roll Forward]        
Asbestos reserve $ 352 [1] $ 380 [1] $ 419 [1] $ 415
Ashland [Member] | Other Current Liabilities [Member]        
Asbestos claims [Roll Forward]        
Asbestos reserve 28 30    
Hercules [Member]        
Asbestos claims [Roll Forward]        
Asbestos reserve 252 [2] 282 [2] $ 323 [2] $ 321
Hercules [Member] | Other Current Liabilities [Member]        
Asbestos claims [Roll Forward]        
Asbestos reserve $ 21 $ 20    
[1] Included $28 million and $30 million classified in accrued expenses and other liabilities on the Consolidated Balance Sheets as of September 30, 2019 and 2018, respectively.
[2] Included $21 million and $20 million classified in accrued expenses and other liabilities on the Consolidated Balance Sheets as of September 30, 2019 and 2018, respectively.