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Benefit Plans (Tables) | 3 Months Ended
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Dec. 31, 2021
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 months ended December 31, 2021 and 2020, were as follows:
Components of TVA's Benefit Plans(1) (in millions)
| Three Months Ended December 31 |  |
| Pension Benefits |  | Other Post-Retirement Benefits |  |  |  |
| 2021 |  | 2020 |  | 2021 |  | 2020 |  |  |  |  |  |  |  |
Service cost | $ | 13 |  |  | $ | 14 |  |  | $ | 4 |  |  | $ | 5 |  |  |  |  |  |  |  |  |
Interest cost | 94 |  |  | 91 |  |  | 4 |  |  | 4 |  |  |  |  |  |  |  |  |
Expected return on plan assets | (109) |  |  | (123) |  |  | — |  |  | — |  |  |  |  |  |  |  |  |
Amortization of prior service credit | (23) |  |  | (24) |  |  | (4) |  |  | (5) |  |  |  |  |  |  |  |  |
Recognized net actuarial loss | 96 |  |  | 112 |  |  | 1 |  |  | 3 |  |  |  |  |  |  |  |  |
Total net periodic benefit cost as actuarially determined | 71 |  |  | 70 |  |  | 5 |  |  | 7 |  |  |  |  |  |  |  |  |
Amount expensed due to actions of regulator | 6 |  |  | 7 |  |  | — |  |  | — |  |  |  |  |  |  |  |  |
Total net periodic benefit cost | $ | 77 |  |  | $ | 77 |  |  | $ | 5 |  |  | $ | 7 |  |  |  |  |  |  |  |  |
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 http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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