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Defined Benefit Pension and Other Postretirement Plans (Tables) | 6 Months Ended
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Mar. 31, 2025
Retirement Benefits [Abstract] |
Schedule of Components of Net Periodic Pension Benefit Cost (Income) | Net periodic pension benefit cost (income) includes the following components:
|  | Pension Benefits
Three Months Ended March 31, |  | 2025 |  | 2024
Service cost |  | $ | 3 |  |  | $ | 2 |
Interest cost |  | 8 |  |  | 9 |
Expected return on plan assets |  | (12) |  |  | (11) |
Amortization of: |  |  |  |
Actuarial loss (gain) |  | 1 |  |  | 1 |
Net benefit cost (income) |  | $ | — |  |  | $ | 1 |
Six Months Ended March 31, |  | 2025 |  | 2024
Service cost |  | $ | 5 |  |  | $ | 4 |
Interest cost |  | 17 |  |  | 18 |
Expected return on plan assets |  | (24) |  |  | (22) |
Amortization of: |  |  |  |
Actuarial loss (gain) |  | 2 |  |  | 1 |
Net benefit cost (income) |  | $ | — |  |  | $ | 1 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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