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Litigation, Claims and Contingencies - Additional Information (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
WasteTreatmentorDisposalSite
Facility
ServiceStationProperty
Jun. 30, 2020
USD ($)
WasteTreatmentorDisposalSite
Facility
ServiceStationProperty
Jun. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Environmental Remediation Costs Recognized [Abstract]              
Number of waste treatment or disposal sites were company is identified as a potentially responsible party under the superfund or similar state laws | WasteTreatmentorDisposalSite 83 83          
Number of current and former operating facilities subject to various environmental laws | Facility 113 113          
Total number of service station properties subject to various environmental laws | ServiceStationProperty 1,225 1,225          
Number of service stations being actively remediated | ServiceStationProperty 27 27          
Accrual for environmental loss contingencies $ 198 $ 198 $ 192 $ 186 $ 187    
Accrued environmental loss contingencies, noncurrent 155 155   143      
Recorded third-party environmental recoveries receivable 15 15   13      
Recorded third-party environmental recoveries, noncurrent $ 13 $ 13   12      
Maximum reserve for remediation reserve related to any one site (in hundredths) 14.00% 14.00%          
Minimum [Member]              
Asbestos litigation cost projection [Abstract]              
Number of Years Included in Asbestos Assumption   40 years          
Maximum [Member]              
Asbestos litigation cost projection [Abstract]              
Number of Years Included in Asbestos Assumption   50 years          
Environmental Remediation Costs Recognized [Abstract]              
Environmental exit costs, reasonably possible additional loss   $ 480          
Ashland [Member]              
Asbestos claims [Roll Forward]              
Increase (decrease) in asbestos-related claims $ 13 13 1 1 (8) $ 36  
Total reserves for asbestos claims 341 [1] 341 [1] 360 352 [1] 380 419 $ 415
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance receivable 105 [2] 105 [2] 130 123 [2] 140 155 151
Receivable adjustment 1 1 (5) (5) (5) 15  
Asbestos litigation cost projection [Abstract]              
Possible total future litigation defense and claim settlement costs 520 520          
Hercules [Member]              
Asbestos claims [Roll Forward]              
Increase (decrease) in asbestos-related claims (3) (3) (10) (10) (19) 16  
Total reserves for asbestos claims 235 [3] 235 [3] 257 252 [3] 282 323 321
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance receivable 47 47 49 49 54 68 $ 63
Receivable adjustment (2) (2) $ (5) $ (5) $ (14) $ 5  
Asbestos litigation cost projection [Abstract]              
Possible total future litigation defense and claim settlement costs $ 350 $ 350          
[1] Included $29 million and $28 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both June 30, 2020 and September 30, 2019.
[2] Included $14 million and $15 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of June 30, 2020 and September 30, 2019
[3] Included $22 million and $21 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both June 30, 2020 and September 30, 2019.