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Benefit Plans (Tables)
 6 Months Ended
Mar. 31, 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 six months ended March 31, 2013, and 2012, were as follows:

Components of TVA’s Benefit Plans 
 
For the Three Months Ended March 31
 
For the Six Months Ended March 31
 
Pension Benefits
 
Other Post-Retirement Benefits
 
Pension Benefits
 
Other Post-retirement Benefits
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
$
43

 
$
34

 
$
7

 
$
4

 
$
77

 
$
69

 
$
12

 
$
9

Interest cost
111

 
123

 
6

 
9

 
234

 
245

 
15

 
18

Expected return on plan assets
(105
)
 
(109
)
 
—

 
—

 
(214
)
 
(218
)
 
—

 
—

Amortization of prior service cost
(5
)
 
(6
)
 
(1
)
 
(1
)
 
(11
)
 
(12
)
 
(3
)
 
(3
)
Recognized net actuarial loss
98

 
90

 
6

 
8

 
188

 
180

 
13

 
15

Total net periodic benefit cost recognized
$
142

 
$
132

 
$
18

 
$
20

 
$
274

 
$
264

 
$
37

 
$
39