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Benefit Plans (Tables)
 6 Months Ended
Mar. 31, 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 six months ended March 31, 2019 and 2018, 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
 
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
Service cost
$
10

 
$
13

 
$
3

 
$
3

 
$
22

 
$
27

 
$
6

 
$
7

 
Interest cost
126

 
119

 
5

 
4

 
249

 
237

 
9

 
9

 
Expected return on plan assets
(120
)
 
(119
)
 
—

 
—

 
(239
)
 
(239
)
 
—

 
—

 
Amortization of prior service credit
(24
)
 
(24
)
 
(6
)
 
(5
)
 
(49
)
 
(49
)
 
(12
)
 
(11
)
 
Recognized net actuarial loss
86

 
101

 
1

 
2

 
168

 
204

 
2

 
4

 
Total net periodic benefit cost as actuarially determined
78

 
90

 
3

 
4

 
151

 
180

 
5

 
9

 
Amount expensed (capitalized) due to actions of regulator
(2
)
 
(13
)
 
—

 
—

 
1

 
(27
)
 
—

 
—

 
Total net periodic benefit cost
$
76

 
$
77

 
$
3

 
$
4

 
$
152

 
$
153

 
$
5

 
$
9