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Benefit Plans (Tables)
 6 Months Ended
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