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Benefit Plans (Tables) | 9 Months Ended
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Jun. 30, 2022
Retirement Benefits [Abstract] |
Components of TVA's Benefit Plans | The components of net periodic benefit cost and other amounts recognized as changes in regulatory assets for the three and nine months ended June 30, 2022 and 2021, were as follows:
Components of TVA's Benefit Plans(1) (in millions)
| For the Three Months Ended June 30 |  | For the Nine Months Ended June 30
| Pension Benefits |  | Other Post-Retirement Benefits |  | Pension Benefits |  | Other Post-Retirement Benefits
| 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $ | 13 |  |  | $ | 14 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 39 |  |  | $ | 42 |  |  | $ | 13 |  |  | $ | 14 |
Interest cost | 94 |  |  | 92 |  |  | 4 |  |  | 4 |  |  | 283 |  |  | 276 |  |  | 11 |  |  | 12 |
Expected return on plan assets | (108) |  |  | (123) |  |  | — |  |  | — |  |  | (326) |  |  | (369) |  |  | — |  |  | — |
Amortization of prior service credit | (23) |  |  | (24) |  |  | (5) |  |  | (5) |  |  | (70) |  |  | (73) |  |  | (13) |  |  | (14) |
Recognized net actuarial loss | 97 |  |  | 113 |  |  | 2 |  |  | 3 |  |  | 294 |  |  | 340 |  |  | 5 |  |  | 8 |
Total net periodic benefit cost as actuarially determined | 73 |  |  | 72 |  |  | 6 |  |  | 7 |  |  | 220 |  |  | 216 |  |  | 16 |  |  | 20 |
Amount expensed due to actions of regulator | 3 |  |  | 5 |  |  | — |  |  | — |  |  | 10 |  |  | 14 |  |  | — |  |  | — |
Total net periodic benefit cost | $ | 76 |  |  | $ | 77 |  |  | $ | 6 |  |  | $ | 7 |  |  | $ | 230 |  |  | $ | 230 |  |  | $ | 16 |  |  | $ | 20 |
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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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