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Litigation, Claims and Contingencies - Summary of Progression of Insurance Receivable (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance settlement $ 3 $ 0 $ 3 $ 1      
Ashland [Member]              
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance receivable - beginning of year     100 [1] 103 [1] $ 103 [1] $ 123 [1] $ 140
Receivable adjustment [2]     0 (2) 6 1 (5)
Insurance settlement     0 (0) (0) (10) 0
Amounts collected     (2) (5) (9) (11) (12)
Insurance receivable - end of period [1] 98 96 98 96 100 103 123
Hercules [Member]              
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance receivable - beginning of year     47 [3] 47 [3] 47 [3] 49 [3] 54
Receivable adjustment [4]     0 (1) 1 (2) (5)
Amounts collected     (1) 0 (1) 0 0
Insurance receivable - end of period [3] $ 46 $ 46 $ 46 $ 46 $ 47 $ 47 $ 49
[1] Includes $12 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021.
[2] The six months ended March 31, 2021 includes a reserve adjustment of $2 million related to allowances for credit losses as a result of Ashland’s adoption of the new credit measurement standard. The total allowance for credit losses was $2 million as of March 31, 2022.
[3] Includes $1 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021.
[4] The six months ended March 31, 2021 includes a reserve adjustment of $1 million related to allowances for credit losses as a result of Ashland’s adoption of the new credit measurement standard. The total allowance for credit losses was $1 million as of March 31, 2022.