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Benefit Plans
 6 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Benefit Plans Benefit Plans
TVA sponsors a pension plan that covers most of its full-time employees hired before July 1, 2014, a qualified defined contribution plan ("401(k) plan") that covers most of its full-time employees, two unfunded post-retirement health care plans that provide for non-vested contributions toward the cost of eligible retirees' medical coverage, other post-employment benefits, such as workers' compensation, and the SERP. The pension plan and the 401(k) plan are administered by a separate legal entity, the TVA Retirement System ("TVARS"), which is governed by its own board of directors.

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 $4 $4 $26 $28 $8 $9 
Interest cost95 93 3 4 189 184 7 8 
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 2 2 197 227 3 5 
Total net periodic benefit cost as actuarially determined76 74 5 6 147 144 10 13 
Amount expensed due to actions of regulator1 2 — — 7 9 — — 
Total net periodic benefit cost$77 $76 $5 $6 $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.

    TVA's minimum required pension plan contribution for 2022 is $300 million. TVA contributes $25 million per month to TVARS and as of March 31, 2022, had contributed $150 million. The remaining $150 million will be contributed by September 30, 2022. For the six months ended March 31, 2022, TVA also contributed $51 million to the 401(k) plan, $14 million (net of $2 million in rebates) to the other post-retirement plans, and $8 million to the SERP.