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Litigation, Claims and Contingencies - Additional Information (Details) $ in Millions | 12 Months Ended |
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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.

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