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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Parenthetical) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Ashland [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve $ 342 [1] $ 352 [1] $ 369 [1] $ 380 [1] $ 419 [1] $ 415
Ashland [Member] | Other Current Liabilities [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve 28 28        
Hercules [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve 247 [2] 252 [2] $ 276 [2] $ 282 [2] $ 323 [2] $ 321
Hercules [Member] | Other Current Liabilities [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve $ 21 $ 21        
[1] Included $28 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both December 31, 2019 and September 30, 2019.
[2] Included $21 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both December 31, 2019 and September 30, 2019.