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Litigation, Claims and Contingencies - Summary of Progression of Insurance Receivable (Parenthetical) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Ashland [Member]            
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]            
Insurance receivable $ 95 [1] $ 97 [1] $ 91 [1] $ 95 [1] $ 101 [1] $ 100
Total allowance for credit losses 1 1        
Ashland [Member] | Accounts Receivable [Member]            
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]            
Insurance receivable 9 9        
Hercules [Member]            
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]            
Insurance receivable 46 [2] 50 [2] $ 45 [2] $ 47 [2] $ 52 [2] $ 47
Total 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 $9 million classified in accounts receivable, net on the Condensed Consolidated Balance Sheets at March 31, 2025 and September 30, 2024.
[2] Includes $6 million classified in accounts receivable, net on the Condensed Consolidated Balance Sheets at March 31, 2025 and September 30, 2024.