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Litigation, Claims and Contingencies - Additional Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Mar. 31, 2022
USD ($)
ServiceStationProperty
WasteTreatmentOrDisposalSite
Facility
Mar. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
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   77          
Number of current and former operating facilities subject to various environmental laws | Facility   112          
Total number of service station properties subject to various environmental laws | ServiceStationProperty   1,225          
Number of service stations being actively remediated | ServiceStationProperty   17          
Accrual for environmental loss contingencies   $ 192 $ 193 $ 207 $ 200    
Accrued environmental loss contingencies, noncurrent   137   152      
Recorded third-party environmental recoveries receivable   17   16      
Recorded third-party environmental recoveries, noncurrent   15   13      
Environmental exit costs, reasonably possible additional loss   $ 455          
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          
Ashland [Member]              
Asbestos reserve [Roll Forward]              
Increase (decrease) in asbestos related reserve $ 12 $ 0 0 12 13 $ 1  
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance receivable   98 [1] 96 [1] 100 [1] 103 [1] 123 [1] $ 140
Receivable adjustment 8            
Asbestos litigation cost projection [Abstract]              
Possible total future litigation defense and claim settlement costs   482          
Total reserves for asbestos claims   301 [2] 320 [2] 320 [2] 335 [2] 352 [2] 380
Hercules [Member]              
Asbestos reserve [Roll Forward]              
Increase (decrease) in asbestos related reserve $ 8 0 (0) 8 (3) (10)  
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Insurance receivable   46 [3] 46 [3] 47 [3] 47 [3] 49 [3] 54
Receivable adjustment   2          
Asbestos litigation cost projection [Abstract]              
Possible total future litigation defense and claim settlement costs   334          
Total reserves for asbestos claims   $ 207 [4] $ 220 [4] $ 217 [4] $ 229 [4] $ 252 [4] $ 282
[1] Includes $12 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021.
[2] Included $29 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021.
[3] Includes $1 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021.
[4] Included $17 million and $18 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of March 31, 2022 and September 30, 2021, respectively.