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Benefit Plans
 9 Months Ended
Jun. 30, 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 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 $5 $4 $42 $41 $14 $12 
Interest cost92 104 4 4 276 312 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 3 2 340 327 8 7 
Total net periodic benefit cost as actuarially determined72 80 7 4 216 241 20 13 
Amount expensed / (capitalized) due to actions of regulator5 (3)— — 14 (11)— — 
Total net periodic benefit cost$77 $77 $7 $4 $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.

    TVA's minimum required pension plan contribution for 2021 is $300 million. TVA contributes $25 million per month to TVARS and as of June 30, 2021, had contributed $225 million. The remaining $75 million will be contributed by September 30,
2021. For the nine months ended June 30, 2021, TVA also contributed $70 million to the 401(k) plan, $20 million (net of $2 million in rebates) to the other post-retirement plans, and $6 million to the SERP.