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Benefit Plans (Tables)
 6 Months Ended
Mar. 31, 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 six months ended March 31, 2016, and 2015, 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
 
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
Service cost
$
34

 
$
31

 
$
4

 
$
3

 
$
66

 
$
65

 
$
8

 
$
8

 
Interest cost
142

 
137

 
8

 
7

 
282

 
270

 
15

 
15

 
Expected return on plan assets
(112
)
 
(109
)
 
—

 
—

 
(223
)
 
(218
)
 
—

 
—

 
Amortization of prior service credit
(5
)
 
(6
)
 
(2
)
 
(1
)
 
(11
)
 
(11
)
 
(3
)
 
(3
)
 
Recognized net actuarial loss
82

 
81

 
1

 
2

 
155

 
150

 
3

 
4

 
Total net periodic benefit cost as actuarially determined
141

 
134

 
11

 
11

 
269

 
256

 
23

 
24

 
Amount capitalized due to actions of regulator
(71
)
 
(63
)
 
—

 
—

 
(129
)
 
(114
)
 
—

 
—

 
Total net periodic benefit cost
$
70

 
$
71

 
$
11

 
$
11

 
$
140

 
$
142

 
$
23

 
$
24