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Benefit Plans (Tables)
 3 Months Ended
Dec. 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 months ended December 31, 2018 and 2017, were as follows:
Components of TVA's Benefit Plans(1)
 
For the Three Months Ended December 31
 
 
Pension Benefits
 
Other Post-Retirement Benefits
 
 
2018
 
2017
 
2018
 
2017
 
Service cost
$
12

 
$
14

 
$
3

 
$
4

 
Interest cost
123

 
118

 
4

 
5

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

 
—

 
Amortization of prior service credit
(25
)
 
(25
)
 
(6
)
 
(6
)
 
Recognized net actuarial loss
82

 
103

 
1

 
2

 
Total net periodic benefit cost as actuarially determined
73

 
90

 
2

 
5

 
Amount expensed (capitalized) due to actions of regulator
3

 
(14
)
 
—

 
—

 
Total net periodic benefit cost
$
76

 
$
76

 
$
2

 
$
5