Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2024 |
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| Statement of Comprehensive Income [Abstract] | |||
| Pension and other postretirement benefit plan adjustments, tax (expense) benefit | $ 73 | $ 31 | $ 7 |
| Net change in cash flow hedges, tax benefit (expense) | $ (5) | $ (2) | $ 11 |
| X | ||||||||||
- Definition Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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