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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Ashland [Member]          
Asbestos reserve [Roll Forward]          
Asbestos reserve - beginning of year $ 274 [1] $ 281 [1] $ 281 [1] $ 305 [1] $ 320
Reserve adjustment 0 0 24 9 16
Amounts paid (18) (18) (31) (33) (31)
Asbestos reserve - end of period [1] 256 263 274 281 305
Hercules [Member]          
Asbestos reserve [Roll Forward]          
Asbestos reserve - beginning of year 185 [2] 191 [2] 191 [2] 213 [2] 217
Reserve adjustment 0 0 14 (2) 15
Amounts paid (5) (11) (20) (20) (19)
Asbestos reserve - end of period [2] $ 180 $ 180 $ 185 $ 191 $ 213
[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.