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Benefit Plans
 6 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Benefit Plans Benefit Plans
TVA sponsors a qualified defined benefit plan ("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, 2021 and 2020, were as follows:
Components of TVA's Benefit Plans(1)
 
For the Three Months Ended March 31
For the Six Months Ended March 31
 Pension BenefitsOther Post-Retirement BenefitsPension BenefitsOther Post-Retirement Benefits
 20212020202120202021202020212020
Service cost$14 $15 $4 $4 $28 $27 $9 $8 
Interest cost93 104 4 4 184 208 8 8 
Expected return on plan assets(123)(122)— — (246)(244)— — 
Amortization of prior service credit(25)(24)(4)(6)(49)(48)(9)(12)
Recognized net actuarial loss115 109 2 3 227 218 5 5 
Total net periodic benefit cost as actuarially determined74 82 6 5 144 161 13 9 
Amount expensed / (capitalized) due to actions of regulator2 (6)— — 9 (8)— — 
Total net periodic benefit cost$76 $76 $6 $5 $153 $153 $13 $9 
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 2021 is $300 million. TVA contributes $25 million per month to TVARS and as of March 31, 2021, had contributed $150 million. The remaining $150 million will be contributed by September
30, 2021. For the six months ended March 31, 2021, TVA also contributed $48 million to the 401(k) plan, $13 million (net of $1 million in rebates) to the other post-retirement plans, and $5 million to the SERP.