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Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 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 nine months ended June 30, 2018 and 2017, 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
 
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
Service cost
$
13

 
$
15

 
$
4

 
$
5

 
$
40

 
$
45

 
$
11

 
$
14

 
Interest cost
118

 
116

 
5

 
4

 
355

 
348

 
14

 
15

 
Expected return on plan assets
(119
)
 
(114
)
 
—

 
—

 
(358
)
 
(342
)
 
—

 
—

 
Amortization of prior service credit
(25
)
 
(25
)
 
(5
)
 
(5
)
 
(74
)
 
(74
)
 
(16
)
 
(16
)
 
Recognized net actuarial loss
103

 
118

 
1

 
3

 
307

 
354

 
5

 
10

 
Total net periodic benefit cost as actuarially determined
90

 
110

 
5

 
7

 
270

 
331

 
14

 
23

 
Amount capitalized due to actions of regulator
(13
)
 
(34
)
 
—

 
—

 
(40
)
 
(102
)
 
—

 
—

 
Total net periodic benefit cost
$
77

 
$
76

 
$
5

 
$
7

 
$
230

 
$
229

 
$
14

 
$
23