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Benefit Plans (Tables)
 6 Months Ended
Mar. 31, 2020
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, 2020 and 2019, were as follows:
Components of TVA's Benefit Plans(1)
 
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
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Service cost
$
15

 
$
10

 
$
4

 
$
3

 
$
27

 
$
22

 
$
8

 
$
6

Interest cost
104

 
126

 
4

 
5

 
208

 
249

 
8

 
9

Expected return on plan assets
(122
)
 
(120
)
 
—

 
—

 
(244
)
 
(239
)
 
—

 
—

Amortization of prior service credit
(24
)
 
(24
)
 
(6
)
 
(6
)
 
(48
)
 
(49
)
 
(12
)
 
(12
)
Recognized net actuarial loss
109

 
86

 
3

 
1

 
218

 
168

 
5

 
2

Total net periodic benefit cost as actuarially determined
82

 
78

 
5

 
3

 
161

 
151

 
9

 
5

Amount expensed (capitalized) due to actions of regulator
(6
)
 
(2
)
 
—

 
—

 
(8
)
 
1

 
—

 
—

Total net periodic benefit cost
$
76

 
$
76

 
$
5

 
$
3

 
$
153

 
$
152

 
$
9

 
$
5