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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, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Ashland [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve - beginning of year $ 352 [1]   $ 380 [1] $ 380 [1] $ 419 [1] $ 415
Reserve adjustment 0 $ 1 0 1 (8) 36
Amounts paid (10)   (11) (29) (31) (32)
Asbestos reserve - end of period [1] 342   369 352 380 419
Hercules [Member]            
Asbestos reserve [Roll Forward]            
Asbestos reserve - beginning of year 252 [2]   282 [2] 282 [2] 323 [2] 321
Reserve adjustment 0 $ (10) 0 (10) (19) 16
Amounts paid (5)   (6) (20) (22) (14)
Asbestos reserve - end of period [2] $ 247   $ 276 $ 252 $ 282 $ 323
[1] Included $28 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both December 31, 2019 and September 30, 2019.
[2] Included $21 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both December 31, 2019 and September 30, 2019.