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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Parenthetical) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Ashland [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve $ 256 [1] $ 274 [1] $ 263 [1] $ 281 [1] $ 305 [1] $ 320
Ashland [Member] | Other Current Liabilities [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve 28 28        
Hercules [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve 180 [2] 185 [2] $ 180 [2] $ 191 [2] $ 213 [2] $ 217
Hercules [Member] | Other Current Liabilities [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve $ 17 $ 17        
[1] Includes $28 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of March 31, 2025 and September 30, 2024.
[2] Includes $17 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets at March 31, 2025 and September 30, 2024.