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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, 2019
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Ashland [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve - beginning of year   $ 380 [1] $ 419 [1] $ 419 [1] $ 415 [1] $ 409
Reserve adjustment $ 1 1 (8) (8) 36 37
Amounts paid   (21) (26) (31) (32) (31)
Asbestos reserve - end of period [1] 360 360 385 380 419 415
Hercules [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve - beginning of year   282 [2] 323 [2] 323 [2] 321 [2] 311
Reserve adjustment (10) (10) (19) (19) 16 25
Amounts paid   (15) (15) (22) (14) (15)
Asbestos reserve - end of period [2] $ 257 $ 257 $ 289 $ 282 $ 323 $ 321
[1] Includes $28 million and $30 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of June 30, 2019 and September 30, 2018, respectively.
[2] Included $13 million and $20 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of June 30, 2019 and September 30, 2018, respectively.