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Revenue (Tables)
 12 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Revenues
Revenues

TVA recognizes revenue from contracts with customers to depict the transfer of goods or services to customers in an amount to which the entity expects to be entitled in exchange for those goods or services. For the generation and transmission of electricity, this is generally at the time the power is delivered to a metered customer delivery point for the customer's consumption or distribution. As a result, revenues from power sales are recorded as electricity is delivered to customers. In addition to power sales invoiced and recorded during the month, TVA accrues estimated unbilled revenues for power sales provided to five customers whose billing date occurs prior to the end of the month.  Exchange power sales are presented in the accompanying Consolidated Statements of Operations as a component of sales of electricity. Exchange power sales are sales of excess power after meeting TVA native load and directly served requirements.  Native load refers to the customers on whose behalf a company, by statute, franchise, regulatory requirement, or contract, has undertaken an obligation to serve. TVA
engages in other arrangements in addition to power sales. Certain other revenue from activities related to TVA's overall mission is recorded in Other revenue. Revenues that are not related to the overall mission are recorded in Other income, net.
Disaggregation of Revenue [Table Text Block] TVA's operating revenues by state for each of the last three years are detailed in the table below:
Operating Revenues By State
For the years ended September 30
(in millions)
 202520242023
Alabama
$1,995 $1,768 $1,731 
Georgia
329 295 284 
Kentucky
850 776 773 
Mississippi
1,254 1,150 1,146 
North Carolina
88 89 89 
Tennessee
8,915 7,998 7,819 
Virginia
52 47 46 
Subtotal13,483 12,123 11,888 
Off-system sales7 8 14 
Revenue capitalized during pre-commercial plant operations(1)
(4)(3)(3)
Revenue from sales of electricity13,486 12,128 11,899 
Other revenue186 186 155 
Total operating revenues$13,672 $12,314 $12,054 
Note
(1) Represents revenue capitalized during pre-commercial operations at Johnsonville Aeroderivative CT Units 21-30 in 2025 and Paradise CT Units 5-7 in 2024.
Revenue from External Customers by Products and Services TVA's operating revenues by customer type for each of the last three years are detailed in the table below:
Operating Revenues by Customer Type
For the years ended September 30
(in millions)
 202520242023
Revenue from sales of electricity  
Local power companies$12,334 $11,138 $10,903 
Industries directly served1,017 868 864 
Federal agencies and other139 125 135 
Revenue capitalized during pre-commercial plant operations(1)
(4)(3)(3)
Revenue from sales of electricity13,486 12,128 11,899 
Other revenue186 186 155 
Total operating revenues$13,672 $12,314 $12,054 
Note
(1) Represents revenue capitalized during pre-commercial operations at Johnsonville Aeroderivative CT Units 21-30 in 2025 and Paradise CT Units 5-7 in 2024.
Schedule of Long-Term Contracts for Purchase of Electric Power
The number of LPCs by contract arrangement, the revenues derived from such arrangements for 2025, and the percentage those revenues comprised of TVA's total operating revenues for 2025, are summarized in the table below:
TVA Local Power Company Contracts
At or for the year ended September 30, 2025
Contract Arrangements(1)
Number of LPCs Revenue from Sales of Electricity to LPCs
(in millions)		Percentage of Total Operating Revenues
20-year termination notice148 $10,636 77.8 %
5-year termination notice5 1,698 12.4 %
Total153 $12,334 90.2 %
Note
(1) Ordinarily, the LPCs and TVA have the same termination notice period; however, in a contract with one of the LPCs with a five-year termination notice, TVA has a 10-year termination notice (which becomes a five-year termination notice if TVA loses its discretionary wholesale rate-setting authority). Certain LPCs have five-year termination notices or a shorter period if any act of Congress, court decision, or regulatory change requires or permits that election.