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Benefit Plans (Tables) | 9 Months Ended
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Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract] |
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, 2014, and 2013, were as follows:
Components of TVA’s Benefit Plans |
| 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 |
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013 |
Service cost | $ | 33 |  |  | $ | 38 |  |  | $ | 5 |  |  | $ | 6 |  |  | $ | 98 |  |  | $ | 115 |  |  | $ | 14 |  |  | $ | 18 |  |
Interest cost | 139 |  |  | 117 |  |  | 8 |  |  | 8 |  |  | 418 |  |  | 351 |  |  | 24 |  |  | 23 |  |
Expected return on plan assets | (109 | ) |  | (107 | ) |  | — |  |  | — |  |  | (326 | ) |  | (321 | ) |  | — |  |  | — |  |
Amortization of prior service cost | (5 | ) |  | (6 | ) |  | (2 | ) |  | (2 | ) |  | (16 | ) |  | (17 | ) |  | (5 | ) |  | (5 | ) |
Recognized net actuarial loss | 71 |  |  | 95 |  |  | 3 |  |  | 6 |  |  | 214 |  |  | 283 |  |  | 8 |  |  | 19 |  |
Total net periodic benefit cost recognized | $ | 129 |  |  | $ | 137 |  |  | $ | 14 |  |  | $ | 18 |  |  | $ | 388 |  |  | $ | 411 |  |  | $ | 41 |  |  | $ | 55 |  |

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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=35743120&loc=d3e1928-114920 + Details
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