XML 63 R39.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Benefit Plans (Tables) | 3 Months Ended
--- | ---
Dec. 31, 2017
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, 2017 and 2016, were as follows:
Components of TVA’s Benefit Plans
| For the Three Months Ended December 31
| Pension Benefits |  | Other Post-Retirement Benefits
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 14 |  |  | $ | 17 |  |  | $ | 4 |  |  | $ | 5 |
Interest cost | 118 |  |  | 116 |  |  | 5 |  |  | 5 |
Expected return on plan assets | (120 | ) |  | (114 | ) |  | — |  |  | — |
Amortization of prior service credit | (25 | ) |  | (25 | ) |  | (6 | ) |  | (6 | )
Recognized net actuarial loss | 103 |  |  | 116 |  |  | 2 |  |  | 3 |
Total net periodic benefit cost as actuarially determined | 90 |  |  | 110 |  |  | 5 |  |  | 7 |
Amount capitalized due to actions of regulator | (14 | ) |  | (34 | ) |  | — |  |  | — |
Total net periodic benefit cost | $ | 76 |  |  | $ | 76 |  |  | $ | 5 |  |  | $ | 7 |

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration