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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, 2026
Mar. 31, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Ashland [Member]          
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]          
Insurance receivable - beginning of year $ 95 [1],[2] $ 97 [1],[2] $ 97 [1],[2] $ 95 [1],[2] $ 101
Receivable adjustment 0 0 5 11 3
Amounts collected (4) (2) (7) (9) (9)
Insurance receivable - end of period [1],[2] 91 95 95 97 95
Hercules [Member]          
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]          
Insurance receivable - beginning of year 48 [3],[4] 50 [3],[4] 50 [3],[4] 47 [3],[4] 52
Receivable adjustment 0 0 4 6 (3)
Amounts collected (1) (4) (6) (3) (2)
Insurance receivable - end of period [3],[4] $ 47 $ 46 $ 48 $ 50 $ 47
[1] Includes $10 million classified in accounts receivable, net on the Condensed Consolidated Balance Sheets at both March 31, 2026 and September 30, 2025.
[2] The allowance for credit losses was $1 million at both March 31, 2026 and September 30, 2025.
[3] Includes $6 million classified in accounts receivable, net on the Condensed Consolidated Balance Sheets at both March 31, 2026 and September 30, 2025.
[4] The allowance for credit losses was $1 million at both March 31, 2026 and September 30, 2025.