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Benefit Plans (Tables)
6 Months Ended
Mar. 31, 2022
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 six months ended March 31, 2022 and 2021, were as follows:
Components of TVA's Benefit Plans(1)
(in millions)
 
For the Three Months Ended March 31
For the Six Months Ended March 31
 Pension BenefitsOther Post-Retirement BenefitsPension BenefitsOther Post-Retirement Benefits
 20222021202220212022202120222021
Service cost$13 $14 $$$26 $28 $$
Interest cost95 93 189 184 
Expected return on plan assets(109)(123)— — (218)(246)— — 
Amortization of prior service credit(24)(25)(4)(4)(47)(49)(8)(9)
Recognized net actuarial loss101 115 197 227 
Total net periodic benefit cost as actuarially determined76 74 147 144 10 13 
Amount expensed due to actions of regulator— — — — 
Total net periodic benefit cost$77 $76 $$$154 $153 $10 $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.