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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Parenthetical) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Ashland [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve $ 301 [1] $ 320 [1] $ 320 [1] $ 335 [1] $ 352 [1] $ 380
Ashland [Member] | Other Current Liabilities [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve 29 29        
Hercules [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve 207 [2] 217 [2] $ 220 [2] $ 229 [2] $ 252 [2] $ 282
Hercules [Member] | Other Current Liabilities [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve $ 17 $ 18        
[1] Included $29 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021.
[2] Included $17 million and $18 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021, respectively.