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Defined Benefit Pension and Other Postretirement Plans | 6 Months Ended
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Mar. 31, 2025
Retirement Benefits [Abstract] |
Defined Benefit Pension and Other Postretirement Plans | Note 10 — Defined Benefit Pension and Other Postretirement Plans The Company maintains defined benefit pension plans and other postretirement plans for certain current and former employees. The service cost component of our pension and other postretirement plans, net of amounts capitalized, is reflected in “Operating and administrative expenses” on the Condensed Consolidated Statements of Income. The non-service cost components, net of amounts capitalized by Utilities as a regulatory asset, are reflected in “Other non-operating income (expense), net” on the Condensed Consolidated Statements of Income. Other postretirement benefit cost was not material for all periods presented. 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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