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Benefit Plans (Tables) | 6 Months Ended
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Mar. 31, 2024
Retirement Benefits [Abstract] |
Components of TVA's Benefit Plans | The components of net periodic benefit cost for the three and six months ended March 31, 2024 and 2023, were as follows:
Components of Net Periodic Benefit Cost(1) (in millions)
| For the Three Months Ended March 31 |  | For the Six Months Ended March 31
| Pension Benefits |  | Other Post-Retirement Benefits |  | Pension Benefits |  | Other Post-Retirement Benefits
| 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | $ | 8 |  |  | $ | 7 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | 15 |  |  | $ | 16 |  |  | $ | 5 |  |  | $ | 6 |
Interest cost | 145 |  |  | 142 |  |  | 6 |  |  | 6 |  |  | 289 |  |  | 284 |  |  | 11 |  |  | 11 |
Expected return on plan assets | (123) |  |  | (123) |  |  | — |  |  | — |  |  | (247) |  |  | (246) |  |  | — |  |  | — |
Amortization of prior service credit | (23) |  |  | (22) |  |  | (5) |  |  | (5) |  |  | (45) |  |  | (44) |  |  | (9) |  |  | (9) |
Recognized net actuarial loss (gain) | 25 |  |  | 33 |  |  | 1 |  |  | — |  |  | 50 |  |  | 67 |  |  | — |  |  | — |
Total net periodic benefit cost as actuarially determined | 32 |  |  | 37 |  |  | 4 |  |  | 4 |  |  | 62 |  |  | 77 |  |  | 7 |  |  | 8 |
Amount expensed due to actions of regulator | — |  |  | 20 |  |  | — |  |  | — |  |  | — |  |  | 39 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 32 |  |  | $ | 57 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 62 |  |  | $ | 116 |  |  | $ | 7 |  |  | $ | 8 |
Note (1) The components of net benefit cost other than the service cost component are included in Other net periodic benefit cost on the Consolidated Statements of Operations.

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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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