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Benefit Plans (Tables)
3 Months Ended
Dec. 31, 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 months ended December 31, 2020 and 2019, were as follows:
Components of TVA's Benefit Plans(1)
 
For the Three Months Ended December 31
 Pension BenefitsOther Post-Retirement Benefits
 2020201920202019
Service cost$14 $12 $$
Interest cost91 104 
Expected return on plan assets(123)(122)— — 
Amortization of prior service credit(24)(24)(5)(6)
Recognized net actuarial loss112 109 
Total net periodic benefit cost as actuarially determined70 79 
Amount expensed / (capitalized) due to actions of regulator(2)— — 
Total net periodic benefit cost$77 $77 $$