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Benefit Plans | 6 Months Ended
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Mar. 31, 2024
Retirement Benefits [Abstract] |
Benefit Plans | Benefit Plans TVA sponsors a pension plan that covers most of its full-time employees hired before July 1, 2014, a qualified defined contribution plan ("401(k) plan") that covers most of its full-time employees, two unfunded post-retirement health care plans that provide for non-vested contributions toward the cost of eligible retirees' medical coverage, other post-employment benefits, such as workers' compensation, the SERP, and the RP. The pension plan and the 401(k) plan are administered by a separate legal entity, the TVA Retirement System ("TVARS"), which is governed by its own board of directors. 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. TVA's minimum required pension plan contribution for 2024 is $300 million. TVA contributes $25 million per month to TVARS and as of March 31, 2024, had contributed $150 million. The remaining $150 million will be contributed by September 30, 2024. For the six months ended March 31, 2024, TVA also contributed $60 million to the 401(k) plan, $11 million (net of $2 million in rebates) to the other post-retirement plans, and $3 million to the SERP.

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