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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.

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