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Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
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, 2014, and 2013, 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
 
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
Service cost
$
33

 
$
38

 
$
5

 
$
6

 
$
98

 
$
115

 
$
14

 
$
18

 
Interest cost
139

 
117

 
8

 
8

 
418

 
351

 
24

 
23

 
Expected return on plan assets
(109
)
 
(107
)
 
—

 
—

 
(326
)
 
(321
)
 
—

 
—

 
Amortization of prior service cost
(5
)
 
(6
)
 
(2
)
 
(2
)
 
(16
)
 
(17
)
 
(5
)
 
(5
)
 
Recognized net actuarial loss
71

 
95

 
3

 
6

 
214

 
283

 
8

 
19

 
Total net periodic benefit cost recognized
$
129

 
$
137

 
$
14

 
$
18

 
$
388

 
$
411

 
$
41

 
$
55