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Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2013
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, 2013, and 2012, 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
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
$
38

 
$
34

 
$
6

 
$
5

 
$
115

 
$
103

 
$
18

 
$
14

Interest cost
117

 
123

 
8

 
9

 
351

 
368

 
23

 
27

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

 
—

 
(321
)
 
(327
)
 
—

 
—

Amortization of prior service cost
(6
)
 
(6
)
 
(2
)
 
(1
)
 
(17
)
 
(18
)
 
(5
)
 
(4
)
Recognized net actuarial loss
95

 
90

 
6

 
8

 
283

 
270

 
19

 
23

Total net periodic benefit cost recognized
$
137

 
$
132

 
$
18

 
$
21

 
$
411

 
$
396

 
$
55

 
$
60