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Benefit Plans (Tables)
 6 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Components of TVA's Benefit Plans
The components of net periodic benefit cost for the three and six months ended March 31, 2025 and 2024, were as follows:
Components of Net Periodic Benefit Cost(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
 20252024202520242025202420252024
Service cost$8 $8 $3 $2 $16 $15 $6 $5 
Interest cost132 145 5 6 263 289 9 11 
Expected return on plan assets(127)(123)— — (253)(247)— — 
Amortization of prior service credit(23)(23)(5)(5)(45)(45)(9)(9)
Recognized net actuarial loss (gain)45 25 — 1 87 50 — — 
Total net periodic benefit cost35 32 3 4 68 62 6 7 
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.