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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Parenthetical) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Ashland [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve $ 369 [1] $ 380 [1] $ 409 [1] $ 419 [1] $ 415 [1] $ 409
Ashland [Member] | Other Current Liabilities [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve 31 30        
Hercules [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve 276 [2] 282 [2] $ 315 [2] $ 323 [2] $ 321 [2] $ 311
Hercules [Member] | Other Current Liabilities [Member]            
Asbestos claims [Roll Forward]            
Asbestos reserve $ 20 $ 20        
[1] Included $31 million and $30 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of December 31, 2018 and September 30, 2018, respectively.
[2] Included $20 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both December 31, 2018 and September 30, 2018.