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Litigation, Claims and Contingencies - Schedule of Progression of Activity in the Asbestos Reserve (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
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 0 $ (8) 0 (8) 36 37
Amounts paid (11)   (10) (31) (32) (31)
Asbestos reserve - end of period [1] 369   409 380 419 415
Hercules [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve - beginning of year 282 [2]   323 [2] 323 [2] 321 [2] 311
Reserve adjustment 0 $ (19) 0 (19) 16 25
Amounts paid (6)   (8) (22) (14) (15)
Asbestos reserve - end of period [2] $ 276   $ 315 $ 282 $ 323 $ 321
[1] Included $31 million and $30 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of December 31, 2018 and September 30, 2018, respectively.
[2] Included $20 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both December 31, 2018 and September 30, 2018.