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Retirement Benefits (Tables) | 6 Months Ended
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Mar. 31, 2025
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | The components of net periodic pension and postretirement benefit cost were (in millions):
| Pension Benefits
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2025 |  | 2024 |  | 2025 |  | 2024
Service cost | $ | 11 |  |  | $ | 9 |  |  | $ | 21 |  |  | $ | 19 |
Interest cost | 34 |  |  | 37 |  |  | 68 |  |  | 73 |
Expected return on plan assets | (42) |  |  | (43) |  |  | (83) |  |  | (85) |
Amortization of net actuarial loss | 7 |  |  | — |  |  | 13 |  |  | — |
Net periodic pension benefit cost | $ | 10 |  |  | $ | 3 |  |  | $ | 19 |  |  | $ | 7 |
| Other Postretirement Benefits
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2025 |  | 2024 |  | 2025 |  | 2024
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | — |  |  | — |  |  | — |  |  | 1 |
Amortization of net actuarial loss | 1 |  |  | 1 |  |  | 2 |  |  | 1 |
Net periodic postretirement benefit cost | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |

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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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