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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Ashland [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve - beginning of year   $ 352 [1] $ 380 $ 380 $ 419 $ 415
Reserve adjustment $ 13 13 1 1 (8) 36
Amounts paid   (24) (21) (29) (31) (32)
Asbestos reserve - end of period 341 [1] 341 [1] 360 352 [1] 380 419
Hercules [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve - beginning of year   252 [2] 282 282 323 321
Reserve adjustment (3) (3) (10) (10) (19) 16
Amounts paid   (14) (15) (20) (22) (14)
Asbestos reserve - end of period $ 235 [2] $ 235 [2] $ 257 $ 252 [2] $ 282 $ 323
[1] Included $29 million and $28 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both June 30, 2020 and September 30, 2019.
[2] Included $22 million and $21 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both June 30, 2020 and September 30, 2019.