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Benefit Plans (Tables)
 3 Months Ended
Dec. 31, 2019
Retirement Benefits [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, 2019 and 2018, were as follows:
Components of TVA's Benefit Plans(1)
 
For the Three Months Ended
December 31
 
Pension Benefits
 
Other Post-Retirement Benefits
 
2019
 
2018
 
2019
 
2018
Service cost
$
12

 
$
12

 
$
4

 
$
3

Interest cost
104

 
123

 
4

 
4

Expected return on plan assets
(122
)
 
(119
)
 
—

 
—

Amortization of prior service credit
(24
)
 
(25
)
 
(6
)
 
(6
)
Recognized net actuarial loss
109

 
82

 
2

 
1

Total net periodic benefit cost as actuarially determined
79

 
73

 
4

 
2

Amount expensed (capitalized) due to actions of regulator
(2
)
 
3

 
—

 
—

Total net periodic benefit cost
$
77

 
$
76

 
$
4

 
$
2