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Benefit Plans (Tables)
 3 Months Ended
Dec. 31, 2014
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, 2014, and 2013, were as follows:

Components of TVA’s Benefit Plans 
 
For the Three Months Ended December 31
 
 
Pension Benefits
 
Other Post-Retirement Benefits
 
 
2014
 
2013
 
2014
 
2013
 
Service cost
$
34

 
$
35

 
$
5

 
$
5

 
Interest cost
133

 
139

 
8

 
9

 
Expected return on plan assets
(109
)
 
(108
)
 
—

 
—

 
Amortization of prior service credit
(5
)
 
(5
)
 
(2
)
 
(2
)
 
Recognized net actuarial loss
69

 
69

 
2

 
3

 
Total net periodic benefit cost as actuarially determined
122

 
130

 
13

 
15

 
Amount capitalized due to actions of regulator
(51
)
 
—

 
—

 
—

 
Total net periodic benefit cost
$
71

 
$
130

 
$
13

 
$
15