XML 87 R77.htm IDEA: XBRL DOCUMENT
v3.20.2

Litigation, Claims and Contingencies - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) WasteTreatmentorDisposalSite Facility ServiceStationProperty | Jun. 30, 2020 USD ($) WasteTreatmentorDisposalSite Facility ServiceStationProperty | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | 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 | 83 |  | 83 |  |  |  |  |  |  |
Number of current and former operating facilities subject to various environmental laws | Facility | 113 |  | 113 |  |  |  |  |  |  |
Total number of service station properties subject to various environmental laws | ServiceStationProperty | 1,225 |  | 1,225 |  |  |  |  |  |  |
Number of service stations being actively remediated | ServiceStationProperty | 27 |  | 27 |  |  |  |  |  |  |
Accrual for environmental loss contingencies | $ 198 |  | $ 198 |  | $ 192 | $ 186 |  | $ 187 |  |
Accrued environmental loss contingencies, noncurrent | 155 |  | 155 |  |  | 143 |  |  |  |
Recorded third-party environmental recoveries receivable | 15 |  | 15 |  |  | 13 |  |  |  |
Recorded third-party environmental recoveries, noncurrent | $ 13 |  | $ 13 |  |  | 12 |  |  |  |
Maximum reserve for remediation reserve related to any one site (in hundredths) | 14.00% |  | 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 |  |  | $ 480 |  |  |  |  |  |  |
Ashland [Member] |  |  |  |  |  |  |  |  |  |
Asbestos claims [Roll Forward] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in asbestos-related claims | $ 13 |  | 13 |  | 1 | 1 |  | (8) | $ 36 |
Total reserves for asbestos claims | 341 | [1] | 341 | [1] | 360 | 352 | [1] | 380 | 419 | $ 415
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |
Insurance receivable | 105 | [2] | 105 | [2] | 130 | 123 | [2] | 140 | 155 | 151
Receivable adjustment | 1 |  | 1 |  | (5) | (5) |  | (5) | 15 |
Asbestos litigation cost projection [Abstract] |  |  |  |  |  |  |  |  |  |
Possible total future litigation defense and claim settlement costs | 520 |  | 520 |  |  |  |  |  |  |
Hercules [Member] |  |  |  |  |  |  |  |  |  |
Asbestos claims [Roll Forward] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in asbestos-related claims | (3) |  | (3) |  | (10) | (10) |  | (19) | 16 |
Total reserves for asbestos claims | 235 | [3] | 235 | [3] | 257 | 252 | [3] | 282 | 323 | 321
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] |  |  |  |  |  |  |  |  |  |
Insurance receivable | 47 |  | 47 |  | 49 | 49 |  | 54 | 68 | $ 63
Receivable adjustment | (2) |  | (2) |  | $ (5) | $ (5) |  | $ (14) | $ 5 |
Asbestos litigation cost projection [Abstract] |  |  |  |  |  |  |  |  |  |
Possible total future litigation defense and claim settlement costs | $ 350 |  | $ 350 |  |  |  |  |  |  |
[1] | Included $29 million and $28 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both June 30, 2020 and September 30, 2019.
[2] | Included $14 million and $15 million classified in accounts receivable on the Condensed Consolidated Balance Sheets as of June 30, 2020 and September 30, 2019
[3] | Included $22 million and $21 million classified in accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets as of both June 30, 2020 and September 30, 2019.

X
- Definition Asbestos assumption period. + References No definition available. + Details
Name: | ash_AsbestosAssumptionPeriod
Namespace Prefix: | ash_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | ash_AsbestosClaimsRollForward
Namespace Prefix: | ash_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Asbestos litigation cost projection. + References No definition available. + Details
Name: | ash_AsbestosLitigationCostProjectionAbstract
Namespace Prefix: | ash_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loss contingency insurance receivable increase (decrease). + References No definition available. + Details
Name: | ash_LossContingencyInsuranceReceivableIncreaseDecrease
Namespace Prefix: | ash_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition No individual remediation location is material, as the largest reserve for any site is less than __% of the remediation reserve. + References No definition available. + Details
Name: | ash_MaximumReserveForRemediationReserveRelatedToAnyOneSiteInHundredths
Namespace Prefix: | ash_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of current and former operating facilities subject to various environmental laws + References No definition available. + Details
Name: | ash_NumberOfCurrentAndFormerOperatingFacilitiesSubjectToVariousEnvironmentalLaws
Namespace Prefix: | ash_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of service station properties subject to various environmental laws. + References No definition available. + Details
Name: | ash_NumberOfServiceStationPropertiesSubjectToVariousEnvironmentalLaws
Namespace Prefix: | ash_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of service stations being actively remediated + References No definition available. + Details
Name: | ash_NumberOfServiceStationsBeingActivelyRemediated
Namespace Prefix: | ash_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of waste treatment or disposal sites subject to various environmental laws. + References No definition available. + Details
Name: | ash_NumberOfWasteTreatmentOrDisposalSitesSubjectToVariousEnvironmentalLaws
Namespace Prefix: | ash_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingencies
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
Name: | us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Estimate of reasonably possible loss exposure in excess of amount accrued for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q4) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14394-108349 + Details
Name: | us-gaap_EnvironmentalExitCostsReasonablyPossibleAdditionalLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EnvironmentalRemediationCostsRecognizedAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12021-110248 + Details
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12053-110248 + Details
Name: | us-gaap_LossContingencyReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_MovementInLossContingencyRelatedReceivableIncreaseDecreaseRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cumulative amount of the asset for third-party recoveries related to environmental remediation obligations that is recoverable after one year from the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
Name: | us-gaap_RecordedThirdPartyEnvironmentalRecoveriesNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of known and reasonably estimable amounts of recoveries from third-parties pertaining to an entity's environmental remediation obligations. An entity's balance sheet may include several assets that relate to an environmental remediation obligation. Among them are the following: a. Receivables from other potentially responsible parties that are not providing initial funding; b. anticipated recoveries from insurers; and c. anticipated recoveries from prior owners as a result of indemnification agreements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237650&loc=d3e13022-110858 + Details
Name: | us-gaap_RecordedThirdPartyEnvironmentalRecoveriesReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
Name: | us-gaap_ValuationAllowancesAndReservesAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
Name: | us-gaap_ValuationAllowancesAndReservesBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ash_AshlandGlobalHoldingsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ash_HerculesLimitedLiabilityCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |