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Litigation, Claims and Contingencies - Additional Information (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2019
USD ($)
Facility
WasteTreatmentorDisposalSite
ServiceStationProperty
Sep. 30, 2018
USD ($)
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 80      
Number of current and former operating facilities subject to various environmental laws | Facility 113      
Total number of service station properties subject to various environmental laws | ServiceStationProperty 1,225      
Number of service stations being actively remediated | ServiceStationProperty 29      
Accrual for environmental loss contingencies $ 186 $ 187 $ 163  
Accrued environmental loss contingencies, noncurrent 143 147    
Recorded third-party environmental recoveries receivable 13 12    
Recorded third-party environmental recoveries, noncurrent 12 11    
Environmental liabilities recognized $ 30 60 17  
Environmental expense related to one site after significant research and analysis   18    
Maximum reserve for remediation reserve related to any one site (in hundredths) 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 $ 440      
Ashland [Member]        
Asbestos claims [Roll Forward]        
Increase (Decrease) in asbestos-related claims 1 (8) 36  
Total reserves for asbestos claims 352 [1] 380 [1] 419 [1] $ 415
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]        
Insurance receivable 123 [2] 140 [2] 155 [2] 151
Receivable adjustment (5) (5) 15  
Asbestos litigation cost projection [Abstract]        
Possible total future litigation defense and claim settlement costs 550      
Total reserves for asbestos claims 352 [1] 380 [1] 419 [1] 415
Hercules [Member]        
Asbestos claims [Roll Forward]        
Increase (Decrease) in asbestos-related claims (10) (19) 16  
Total reserves for asbestos claims 252 [3] 282 [3] 323 [3] 321
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]        
Insurance receivable 49 54 68 63
Receivable adjustment (5) (14) 5  
Asbestos litigation cost projection [Abstract]        
Possible total future litigation defense and claim settlement costs 390      
Total reserves for asbestos claims $ 252 [3] $ 282 [3] $ 323 [3] $ 321
[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 $15 million classified in accounts receivable on the Consolidated Balance Sheets as of September 30, 2019 and 2018.
[3] 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.