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Litigation, Claims and Contingencies - Additional Information (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
WasteTreatmentorDisposalSite
Facility
ServiceStationProperty
Jun. 30, 2018
USD ($)
Dec. 31, 2017
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 81            
Number of current and former operating facilities subject to various environmental laws | Facility 116            
Total number of service station properties subject to various environmental laws | ServiceStationProperty 1,225            
Number of service stations being actively remediated | ServiceStationProperty 35            
Accrual for environmental loss contingencies $ 184   $ 168 $ 187 $ 163    
Accrued environmental loss contingencies, noncurrent 144     147      
Recorded third-party environmental recoveries receivable 12     12      
Recorded third-party environmental recoveries, noncurrent $ 11     11      
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 $ 424            
Ashland [Member]              
Asbestos claims [Roll Forward]              
Decrease in asbestos-related claims 0 $ 8 0 8 (36) $ (37)  
Total reserves for asbestos claims 369 [1]   409 [1] 380 [1] 419 [1] 415 [1] $ 409
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance receivable 139 [2]   151 [2] 140 [2] 155 [2] 151 [2] 150
Receivable adjustment 0 (5) 0 (5) 15 16  
Asbestos litigation cost projection [Abstract]              
Possible total future litigation defense and claim settlement costs 600            
Total reserves for asbestos claims 369 [1]   409 [1] 380 [1] 419 [1] 415 [1] 409
Hercules [Member]              
Asbestos claims [Roll Forward]              
Decrease in asbestos-related claims 0 19 0 19 (16) (25)  
Total reserves for asbestos claims 276 [3]   315 [3] 282 [3] 323 [3] 321 [3] 311
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance receivable 54   68 54 68 63 56
Receivable adjustment 0 $ (14) 0 (14) 5 7  
Asbestos litigation cost projection [Abstract]              
Possible total future litigation defense and claim settlement costs 450            
Total reserves for asbestos claims $ 276 [3]   $ 315 [3] $ 282 [3] $ 323 [3] $ 321 [3] $ 311
[1] Included $31 million and $30 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of December 31, 2018 and September 30, 2018, respectively.
[2] Included $15 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of both December 31, 2018 and September 30, 2018
[3] Included $20 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both December 31, 2018 and September 30, 2018.