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Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2012
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, 2012, and 2011, 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
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost
$
34

 
$
30

 
$
5

 
$
4

 
$
103

 
$
90

 
$
14

 
$
10

Interest cost
123

 
126

 
9

 
8

 
368

 
377

 
27

 
24

Expected return on plan assets
(109
)
 
(122
)
 
—

 
—

 
(327
)
 
(366
)
 
—

 
—

Amortization of prior service cost
(6
)
 
(6
)
 
(1
)
 
(2
)
 
(18
)
 
(18
)
 
(4
)
 
(5
)
Recognized net actuarial loss
90

 
71

 
8

 
5

 
270

 
212

 
23

 
16

Net periodic benefit cost as actuarially determined
132

 
99

 
21

 
15

 
396

 
295

 
60

 
45

Amount charged (capitalized) due to actions of regulator
—

 
3

 
—

 
—

 
—

 
9

 
—

 
—

Total net periodic benefit cost recognized
$
132

 
$
102

 
$
21

 
$
15

 
$
396

 
$
304

 
$
60

 
$
45