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Benefit Plans (Tables) | 6 Months Ended
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Mar. 31, 2018
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 six months ended March 31, 2018 and 2017, were as follows:
Components of TVA's Benefit Plans
| 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 |
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Service cost | $ | 13 |  |  | $ | 13 |  |  | $ | 3 |  |  | $ | 5 |  |  | $ | 27 |  |  | $ | 30 |  |  | $ | 7 |  |  | $ | 9 |  |
Interest cost | 119 |  |  | 116 |  |  | 4 |  |  | 4 |  |  | 237 |  |  | 232 |  |  | 9 |  |  | 11 |  |
Expected return on plan assets | (119 | ) |  | (114 | ) |  | — |  |  | — |  |  | (239 | ) |  | (228 | ) |  | — |  |  | — |  |
Amortization of prior service credit | (24 | ) |  | (24 | ) |  | (5 | ) |  | (10 | ) |  | (49 | ) |  | (49 | ) |  | (11 | ) |  | (11 | ) |
Recognized net actuarial loss | 101 |  |  | 120 |  |  | 2 |  |  | 5 |  |  | 204 |  |  | 236 |  |  | 4 |  |  | 7 |  |
Total net periodic benefit cost as actuarially determined | 90 |  |  | 111 |  |  | 4 |  |  | 4 |  |  | 180 |  |  | 221 |  |  | 9 |  |  | 16 |  |
Amount capitalized due to actions of regulator | (13 | ) |  | (34 | ) |  | — |  |  | — |  |  | (27 | ) |  | (68 | ) |  | — |  |  | — |  |
Total net periodic benefit cost | $ | 77 |  |  | $ | 77 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 153 |  |  | $ | 153 |  |  | $ | 9 |  |  | $ | 16 |  |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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