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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Litigation Reserves (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Ashland [Member]          
Asbestos reserve [Roll Forward]          
Asbestos litigation reserves - beginning of year $ 258 [1] $ 274 [1] $ 274 [1] $ 281 [1] $ 305
Reserve adjustment 0 0 16 24 9
Amounts paid (19) (18) (32) (31) (33)
Asbestos litigation reserves - end of period [1] 239 256 258 274 281
Hercules [Member]          
Asbestos reserve [Roll Forward]          
Asbestos litigation reserves - beginning of year 177 [2] 185 [2] 185 [2] 191 [2] 213
Reserve adjustment 0 0 10 14 (2)
Amounts paid (8) (5) (18) (20) (20)
Asbestos litigation reserves - end of period [2] $ 169 $ 180 $ 177 $ 185 $ 191
[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.