Litigation, Claims and Contingencies - Summary of Components of Environmental Remediation Expense Included within Selling, General and Administrative Expense (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Loss Contingencies [Line Items] | ||||
| Environmental expense | $ 21 | $ 46 | $ 32 | $ 49 |
| Accretion | 1 | 1 | 1 | 1 |
| Legal expense | 1 | 0 | 2 | 1 |
| Total expense | $ 23 | $ 47 | $ 35 | $ 51 |
| Environmental Remediation Expense, before Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, General and Administrative Expense | Selling, General and Administrative Expense | Selling, General and Administrative Expense | Selling, General and Administrative Expense |
| Insurance receivable | $ (2) | $ (3) | $ (3) | $ (4) |
| Total expense, net of receivable activity | $ 21 | $ 44 | $ 32 | $ 47 |
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- Definition Environmental Expense No definition available.
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- Definition Environmental remediation expense net of receivable activity. No definition available.
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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, before recovery, of expense for known and estimated future costs arising from requirement to perform environmental remediation. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Indicates line item in statement of income or comprehensive income that includes environmental remediation expense before recovery. Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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- Definition The increase (decrease) during the reporting period in insurance settlements receivable, which are amounts due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. The expectation is that such reimbursement will be received within one year of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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