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Litigation, Claims and Contingencies - Additional Information (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
WasteTreatmentorDisposalSite
Facility
ServiceStationProperty
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
WasteTreatmentorDisposalSite
Facility
ServiceStationProperty
Jun. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
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 82   82          
Number of current and former operating facilities subject to various environmental laws | Facility 115   115          
Total number of service station properties subject to various environmental laws | ServiceStationProperty 1,225   1,225          
Number of service stations being actively remediated | ServiceStationProperty 36   36          
Accrual for environmental loss contingencies $ 192 $ 173 $ 192 $ 173 $ 163 $ 177    
Accrued environmental loss contingencies, noncurrent 150   150   121      
Recorded third-party environmental recoveries receivable 14   14   15      
Recorded third-party environmental recoveries, noncurrent 13   13   14      
Environmental liabilities incurred 37 11 $ 54 16        
Environmental expense related to one site after significant research and analysis $ 18              
Maximum reserve for remediation reserve related to any one site (in hundredths) 15.00%   15.00%          
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]                
Decrease in asbestos-related claims 8   $ 8 (36) (36) (37) $ 0  
Total reserves for asbestos claims 385 [1] 424 [1] 385 [1] 424 [1] 419 [1] 415 [1] 409 [1] $ 438
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]                
Insurance receivable 142 [2] 156 [2] 142 [2] 156 [2] 155 [2] 151 [2] 150 [2] 402
Receivable adjustment (5)   (5) 15 15 16 (3)  
Asbestos litigation cost projection [Abstract]                
Possible total future litigation defense and claim settlement costs 600   600          
Hercules [Member]                
Asbestos claims [Roll Forward]                
Decrease in asbestos-related claims 19   19 (16) (16) (25) (4)  
Total reserves for asbestos claims 289 [3] 328 [3] 289 [3] 328 [3] 323 [3] 321 [3] 311 [3] 329
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]                
Insurance receivable 54 68 54 68 68 63 56 $ 77
Receivable adjustment   $ (14) (14) $ 5 $ 5 $ 7 $ 1  
Asbestos litigation cost projection [Abstract]                
Possible total future litigation defense and claim settlement costs $ 450   $ 450          
[1] Included $31 million and $34 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of June 30, 2018 and September 30, 2017, respectively.
[2] Included $15 million and $14 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of June 30, 2018 and September 30, 2017, respectively.
[3] Included $12 million and $14 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of June 30, 2018 and September 30, 2017, respectively.