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Litigation, Claims and Contingencies - Additional Information (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
WasteTreatmentorDisposalSite
Facility
ServiceStationProperty
Jun. 30, 2019
USD ($)
WasteTreatmentorDisposalSite
Facility
ServiceStationProperty
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
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 80 80          
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 30 30          
Accrual for environmental loss contingencies $ 192 $ 192 $ 192 $ 187 $ 163    
Accrued environmental loss contingencies, noncurrent 152 152   147      
Recorded third-party environmental recoveries receivable 13 13   12      
Recorded third-party environmental recoveries, noncurrent $ 12 $ 12   11      
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   $ 450          
Ashland [Member]              
Asbestos claims [Roll Forward]              
Increase (Decrease) in asbestos-related claims $ 1 1 (8) (8) 36 $ 37  
Total reserves for asbestos claims 360 [1] 360 [1] 385 [1] 380 [1] 419 [1] 415 [1] $ 409
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance receivable 130 [2] 130 [2] 142 [2] 140 [2] 155 [2] 151 [2] 150
Receivable adjustment (5) (5) (5) (5) 15 16  
Asbestos litigation cost projection [Abstract]              
Possible total future litigation defense and claim settlement costs 550 550          
Total reserves for asbestos claims 360 [1] 360 [1] 385 [1] 380 [1] 419 [1] 415 [1] 409
Hercules [Member]              
Asbestos claims [Roll Forward]              
Increase (Decrease) in asbestos-related claims (10) (10) (19) (19) 16 25  
Total reserves for asbestos claims 257 [3] 257 [3] 289 [3] 282 [3] 323 [3] 321 [3] 311
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance receivable 49 49 54 54 68 63 56
Receivable adjustment (5) (5) (14) (14) 5 7  
Asbestos litigation cost projection [Abstract]              
Possible total future litigation defense and claim settlement costs 390 390          
Total reserves for asbestos claims $ 257 [3] $ 257 [3] $ 289 [3] $ 282 [3] $ 323 [3] $ 321 [3] $ 311
[1] Includes $28 million and $30 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of June 30, 2019 and September 30, 2018, respectively.
[2] Includes $18 million and $15 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of June 30, 2019 and September 30, 2018
[3] Included $13 million and $20 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of June 30, 2019 and September 30, 2018, respectively.