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Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2015
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 and nine months ended June 30, 2015, and 2014, were as follows:
Components of TVA’s Benefit Plans 
 
For the Three Months Ended June 30
 
For the Nine Months Ended June 30
 
 
Pension Benefits
 
Other Post-Retirement Benefits
 
Pension Benefits
 
Other Post-Retirement Benefits
 
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
Service cost
$
32

 
$
33

 
$
4

 
$
5

 
$
97

 
$
98

 
$
12

 
$
14

 
Interest cost
135

 
139

 
7

 
8

 
405

 
418

 
22

 
24

 
Expected return on plan assets
(110
)
 
(109
)
 
—

 
—

 
(328
)
 
(326
)
 
—

 
—

 
Amortization of prior service credit
(5
)
 
(5
)
 
(2
)
 
(2
)
 
(16
)
 
(16
)
 
(5
)
 
(5
)
 
Recognized net actuarial loss
75

 
71

 
3

 
3

 
225

 
214

 
7

 
8

 
Total net periodic benefit cost as actuarially determined
127

 
129

 
12

 
14

 
383

 
388

 
36

 
41

 
Amount capitalized due to actions of regulator
(57
)
 
—

 
—

 
—

 
(171
)
 
—

 
—

 
—

 
Total net periodic benefit cost
$
70

 
$
129

 
$
12

 
$
14

 
$
212

 
$
388

 
$
36

 
$
41