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Benefit Plans (Tables)
9 Months Ended
Jun. 30, 2020
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 and nine months ended June 30, 2020 and 2019, were as follows:
Components of TVA's Benefit Plans(1)
 
For the Three Months Ended June 30
For the Nine Months Ended June 30
 Pension BenefitsOther Post-Retirement BenefitsPension BenefitsOther Post-Retirement Benefits
 20202019202020192020201920202019
Service cost$14  $11  $ $ $41  $33  $12  $ 
Interest cost104  125    312  374  12  14  
Expected return on plan assets(122) (119) —  —  (366) (358) —  —  
Amortization of prior service credit(25) (25) (6) (6) (73) (74) (18) (18) 
Recognized net actuarial loss109  84    327  252    
Total net periodic benefit cost as actuarially determined80  76    241  227  13   
Amount (capitalized) / expensed due to actions of regulator(3) —  —  —  (11)  —  —  
Total net periodic benefit cost$77  $76  $ $ $230  $228  $13  $