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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Parenthetical) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Ashland [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve $ 239 [1] $ 258 [1] $ 256 [1] $ 274 [1] $ 281 [1] $ 305
Ashland [Member] | Other Current Liabilities [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve 29 29        
Hercules [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve 169 [2] 177 [2] $ 180 [2] $ 185 [2] $ 191 [2] $ 213
Hercules [Member] | Other Current Liabilities [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve $ 17 $ 17        
[1] Includes $29 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both March 31, 2026 and September 30, 2025.
[2] Includes $17 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets at both March 31, 2026 and September 30, 2025.