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Benefit Plans (Tables)
 3 Months Ended
Dec. 31, 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 months ended December 31, 2015, and 2014, were as follows:
Components of TVA’s Benefit Plans 
 
For the Three Months Ended December 31
 
Pension Benefits
 
Other Post-Retirement Benefits
 
2015
 
2014
 
2015
 
2014
Service cost
$
32

 
$
34

 
$
4

 
$
5

Interest cost
140

 
133

 
7

 
8

Expected return on plan assets
(111
)
 
(109
)
 
—

 
—

Amortization of prior service credit
(6
)
 
(5
)
 
(1
)
 
(2
)
Recognized net actuarial loss
73

 
69

 
2

 
2

Total net periodic benefit cost as actuarially determined
128

 
122

 
12

 
13

Amount capitalized due to actions of regulator
(58
)
 
(51
)
 
—

 
—

Total net periodic benefit cost
$
70

 
$
71

 
$
12

 
$
13