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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Ashland [Member]      
Asbestos reserve [Roll Forward]      
Beginning balance $ 380 [1] $ 419 [1] $ 415
Reserve adjustment 1 (8) 36
Amounts paid (29) (31) (32)
Ending balance [1] 352 380 419
Hercules [Member]      
Asbestos reserve [Roll Forward]      
Beginning balance 282 [2] 323 [2] 321
Reserve adjustment (10) (19) 16
Amounts paid (20) (22) (14)
Ending balance [2] $ 252 $ 282 $ 323
[1] Included $28 million and $30 million classified in accrued expenses and other liabilities on the Consolidated Balance Sheets as of September 30, 2019 and 2018, respectively.
[2] Included $21 million and $20 million classified in accrued expenses and other liabilities on the Consolidated Balance Sheets as of September 30, 2019 and 2018, respectively.