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Benefit Plans (Tables)
9 Months Ended
Jun. 30, 2021
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, 2021 and 2020, 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
 20212020202120202021202020212020
Service cost$14 $14 $$$42 $41 $14 $12 
Interest cost92 104 276 312 12 12 
Expected return on plan assets(123)(122)— — (369)(366)— — 
Amortization of prior service credit(24)(25)(5)(6)(73)(73)(14)(18)
Recognized net actuarial loss113 109 340 327 
Total net periodic benefit cost as actuarially determined72 80 216 241 20 13 
Amount expensed / (capitalized) due to actions of regulator(3)— — 14 (11)— — 
Total net periodic benefit cost$77 $77 $$$230 $230 $20 $13 
Note
(1) The components of net benefit cost other than the service cost component are included in Other net periodic benefit cost on the Consolidated Statements of Operations.