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v3.25.3

Benefit Plans Obligations and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Change in benefit obligation |  |  |  |
Actuarial Gain (Loss) from pre-Medicare Trend Rate Assumptions |  | $ 30 |  |
Actuarial Gain (Loss) from Changes in Mortality Assumptions |  | 5 |  |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] |  |  |  |
Discount rate |  |  | 5.00% | 6.05%
Amount of defined benefit plan actuarial gain (loss) from updated capita claims costs and retiree contributions |  | (18) |  |
Amount of defined benefit plan actuarial gain (loss) from change in mortality assumption |  |  | $ (46) |
Amount of defined benefit plan actuarial gain (loss) from change in demograhic and plan experience |  | 37 |  |
Actuarial Gain (Loss) from Changes in Withdrawal Assumption Rates |  | 2 |  |
Actuarial Gain (Loss) from Observed Plan Experience |  | $ 2 |  |
Percent Funded Status |  | 10000.00% |  |
Pension Benefits |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation |  | $ 11,002 | 10,099 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  | 10,301 | 11,002 |
Service cost |  | 32 | 29 | $ 32
Defined Benefit Plan, Interest Cost |  | 526 | 579 | 568
Plan participants' contributions |  | 3 | 3 |
Change in Plan Assets due to Collections |  | 0 | 0 |
Collections | [1] | 0 | 0 |
Actuarial loss (gain) |  | 457 | 1,059 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment |  | (1) | 0 |
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits |  | 0 | 0 | $ 0
Net transfers from variable fund/401(k) plan |  | 2 | 5 |
Expenses paid |  | (7) | (6) |
Benefits paid |  | 799 | 766 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets |  | 8,594 | 8,673 |
Change in plan assets |  |  |  |
Fair value of net plan assets |  | 8,673 | 8,129 |
Actual return on plan assets |  | 412 | 1,004 |
Employer contributions |  | 310 | 304 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] |  |  |  |
Funded status |  | $ (1,707) | $ (2,329) |
Discount rate |  | 5.47% | 4.95% | 5.95%
Amount of defined benefit plan actuarial gain (loss) from discount rate change |  | $ (514) | $ (981) |
Amount of defined benefit plan actuarial gain (loss) from change in mortality assumption |  | (39) |  |
Amount of defined benefit plan actuarial gain (loss) from change in demograhic and plan experience |  | 18 |  |
Other Post-retirement Benefits |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation |  | 291 | 353 |
Postconfirmation, Other Postretirement Obligations |  |  | 347 |
Service cost |  | 11 | 11 | $ 10
Defined Benefit Plan, Interest Cost |  | 17 | 21 | 18
Plan participants' contributions |  | 0 | 0 |
Change in Plan Assets due to Collections |  | 12 | 12 |
Collections | [1] | 12 | 12 |
Actuarial loss (gain) |  | 67 | 4 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment |  | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits |  | 1 | 0 |
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits |  | 1 | 0 | $ 0
Net transfers from variable fund/401(k) plan |  | 0 | 0 |
Expenses paid |  | 0 | 0 |
Benefits paid |  | 36 | 34 |
Actuarial Gain (Loss) from Changes in Discount Rate |  | 24 | 43 |
Actuarial Gain (Loss) from Delaying post-Medicare Trend Rate Assumption |  | 28 |  |
Change in plan assets |  |  |  |
Fair value of net plan assets |  | 0 | 0 |
Actual return on plan assets |  | 0 | 0 |
Employer contributions |  | 24 | 22 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] |  |  |  |
Funded status |  | $ (291) | $ (353) |
Discount rate |  | 5.62% | 5.00% |
Amount of defined benefit plan actuarial gain (loss) from updated capita claims costs and retiree contributions |  | $ (3) |  |
[1] | Collections include retiree contributions as well as provider discounts and rebates. (2) The 2025 pension obligation plan curtailment gain is a result of the amendments to the TVA SERP in which participants ceased accruing new benefits effective September 30, 2025. This reduced the projected benefit obligation by $1 million. (3) Special/contractual termination benefits for certain eligible employees related to TVA's restructuring activities. For 2025, the other post-retirement plan recognized a loss that increased the obligation by $1 million as a result of special/contractual termination benefits for certain eligible employees related to TVA’s restructuring activities. See Note 3 — Restructuring.

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- Definition Amount of defined benefit plan actuarial gain (loss) from change in demograhic and plan experience + References No definition available. + Details
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- Definition The amount of contributions made by plan participants, federal reinsurance payments, and provider discounts and rebates. This item represents a periodic increase to the plan obligation and an increase to plan assets. + References No definition available. + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (j)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 12: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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