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Benefit Plans (Tables)
 9 Months Ended
Jun. 30, 2016
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 and nine months ended June 30, 2016, and 2015, 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
 
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
Service cost
$
34

 
$
32

 
$
4

 
$
4

 
$
100

 
$
97

 
$
12

 
$
12

 
Interest cost
141

 
135

 
7

 
7

 
423

 
405

 
22

 
22

 
Expected return on plan assets
(112
)
 
(110
)
 
—

 
—

 
(335
)
 
(328
)
 
—

 
—

 
Amortization of prior service credit
(6
)
 
(5
)
 
(2
)
 
(2
)
 
(17
)
 
(16
)
 
(5
)
 
(5
)
 
Recognized net actuarial loss
78

 
75

 
2

 
3

 
233

 
225

 
5

 
7

 
Total net periodic benefit cost as actuarially determined
135

 
127

 
11

 
12

 
404

 
383

 
34

 
36

 
Amount capitalized due to actions of regulator
(64
)
 
(57
)
 
—

 
—

 
(193
)
 
(171
)
 
—

 
—

 
Total net periodic benefit cost
$
71

 
$
70

 
$
11

 
$
12

 
$
211

 
$
212

 
$
34

 
$
36