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Litigation, Claims and Contingencies - Summary of Progression of Insurance Receivable (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]            
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]            
Insurance receivable $ 91 [1],[2] $ 95 [1],[2] $ 95 [1],[2] $ 97 [1],[2] $ 95 [1],[2] $ 101
Allowance for credit losses 1 1        
Ashland [Member] | Accounts Receivable [Member]            
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]            
Insurance receivable 10 10        
Hercules [Member]            
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]            
Insurance receivable 47 [3],[4] 48 [3],[4] $ 46 [3],[4] $ 50 [3],[4] $ 47 [3],[4] $ 52
Allowance for credit losses 1 1        
Hercules [Member] | Accounts Receivable [Member]            
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]            
Insurance receivable $ 6 $ 6        
[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.