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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Ashland [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve - beginning of year $ 320 [1] $ 320 [1] $ 335 [1] $ 335 [1] $ 352 [1] $ 380
Reserve adjustment 12 0 0 12 13 1
Amounts paid   (19) (15) (27) (30) (29)
Asbestos reserve - end of period [1]   301 320 320 335 352
Hercules [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve - beginning of year 220 [2] 217 [2] 229 [2] 229 [2] 252 [2] 282
Reserve adjustment $ 8 0 (0) 8 (3) (10)
Amounts paid   (10) (9) (20) (20) (20)
Asbestos reserve - end of period [2]   $ 207 $ 220 $ 217 $ 229 $ 252
[1] Included $29 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021.
[2] Included $17 million and $18 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021, respectively.