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Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2019
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, 2019 and 2018, were as follows:
Components of TVA's Benefit Plans(1)
 
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
 
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
Service cost
$
11

 
$
13

 
$
2

 
$
4

 
$
33

 
$
40

 
$
8

 
$
11

 
Interest cost
125

 
118

 
5

 
5

 
374

 
355

 
14

 
14

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

 
—

 
(358
)
 
(358
)
 
—

 
—

 
Amortization of prior service credit
(25
)
 
(25
)
 
(6
)
 
(5
)
 
(74
)
 
(74
)
 
(18
)
 
(16
)
 
Recognized net actuarial loss
84

 
103

 
1

 
1

 
252

 
307

 
3

 
5

 
Total net periodic benefit cost as actuarially determined
76

 
90

 
2

 
5

 
227

 
270

 
7

 
14

 
Amount expensed (capitalized) due to actions of regulator
—

 
(13
)
 
—

 
—

 
1

 
(40
)
 
—

 
—

 
Total net periodic benefit cost
$
76

 
$
77

 
$
2

 
$
5

 
$
228

 
$
230

 
$
7

 
$
14