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Litigation, Claims and Contingencies - Summary of Progression of Insurance Receivable (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]          
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]          
Insurance receivable - beginning of year $ 97 [1] $ 95 [1] $ 95 [1] $ 101 [1] $ 100
Receivable adjustment [2] 0 0 11 3 7
Amounts collected (2) (4) (9) (9) (6)
Insurance receivable - end of period [1] 95 91 97 95 101
Hercules [Member]          
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]          
Insurance receivable - beginning of year 50 [3] 47 [3] 47 [3] 52 [3] 47
Receivable adjustment [4] 0 0 6 (3) 7
Amounts collected (4) (2) (3) (2) (2)
Insurance receivable - end of period [3] $ 46 $ 45 $ 50 $ 47 $ 52
[1] Includes $9 million classified in accounts receivable, net on the Condensed Consolidated Balance Sheets at March 31, 2025 and September 30, 2024.
[2] The total allowance for credit losses was $1 million at of March 31, 2025 and September 30, 2024.
[3] Includes $6 million classified in accounts receivable, net on the Condensed Consolidated Balance Sheets at March 31, 2025 and September 30, 2024.
[4] The total allowance for credit losses was $1 million at March 31, 2025 and September 30, 2024.