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Benefit Plans (Tables)
 3 Months Ended
Dec. 31, 2016
Compensation and Retirement Disclosure [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, 2016 and 2015, were as follows:
Components of TVA’s Benefit Plans 
 
For the Three Months Ended December 31
 
 
Pension Benefits
 
Other Post-Retirement Benefits
 
 
2016
 
2015
 
2016
 
2015
 
Service cost
$
17

 
$
32

 
$
5

 
$
4

 
Interest cost
116

 
140

 
5

 
7

 
Expected return on plan assets
(114
)
 
(111
)
 
—

 
—

 
Amortization of prior service credit
(25
)
 
(6
)
 
(6
)
 
(1
)
 
Recognized net actuarial loss
116

 
73

 
3

 
2

 
Total net periodic benefit cost as actuarially determined
110

 
128

 
7

 
12

 
Amount capitalized due to actions of regulator
(34
)
 
(58
)
 
—

 
—

 
Total net periodic benefit cost
$
76

 
$
70

 
$
7

 
$
12