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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, 2018
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Ashland [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve - beginning of year   $ 419 [1] $ 415 [1] $ 415 [1] $ 409 [1] $ 438
Reserve adjustment $ (8) (8) 36 36 37 0
Amounts paid   (26) (27) (32) (31) (29)
Asbestos reserve - end of period [1] 385 385 424 419 415 409
Hercules [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve - beginning of year   323 [2] 321 [2] 321 [2] 311 [2] 329
Reserve adjustment (19) (19) 16 16 25 4
Amounts paid   (15) (9) (14) (15) (22)
Asbestos reserve - end of period [2] $ 289 $ 289 $ 328 $ 323 $ 321 $ 311
[1] Included $31 million and $34 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of June 30, 2018 and September 30, 2017, respectively.
[2] Included $12 million and $14 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of June 30, 2018 and September 30, 2017, respectively.