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Revenue (Tables)
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]    
State [Table Text Block]   TVA's operating revenues by state for the three and six months ended March 31, 2024 and 2023, are detailed in the table below:
Operating Revenues By State
(in millions)
Three Months Ended March 31Six Months Ended March 31
 2024202320242023
Alabama
$457 $428 $865 $856 
Georgia
80 72 149 148 
Kentucky
201 192 378 390 
Mississippi
284 273 539 551 
North Carolina
28 25 51 50 
Tennessee
2,027 1,918 3,816 3,859 
Virginia
14 13 25 26 
Subtotal3,091 2,921 5,823 5,880 
Off-system sales2 3 4 7 
Revenue capitalized during pre-commercial plant operations(1)
— — (3)— 
Revenue from sales of electricity3,093 2,924 5,824 5,887 
Other revenue61 35 95 87 
Total operating revenues$3,154 $2,959 $5,919 $5,974 
Revenue from External Customers by Products and Services [Table Text Block]  
TVA's operating revenues by customer type for the three and six months ended March 31, 2024 and 2023, are detailed in the table below:
Operating Revenues by Customer Type
(in millions)
Three Months Ended March 31Six Months Ended March 31
 2024202320242023
Revenue from sales of electricity  
Local power companies$2,842 $2,674 $5,329 $5,380 
Industries directly served221 217 438 442 
Federal agencies and other30 33 60 65 
Revenue capitalized during pre-commercial plant operations(1)
— — (3)— 
Revenue from sales of electricity3,093 2,924 5,824 5,887 
Other revenue61 35 95 87 
Total operating revenues$3,154 $2,959 $5,919 $5,974 
Schedule of Long-term Contracts for Purchase of Electric Power
The number of LPCs by contract arrangement, the revenues derived from such arrangements for the three and six months ended March 31, 2024, and the percentage those revenues comprised of TVA's total operating revenues for the same periods, are summarized in the table below:

TVA Local Power Company Contracts
At or for the Three Months Ended March 31, 2024
Contract Arrangements(1)
Number of LPCs
Revenue from Sales of Electricity to LPCs
(in millions)
Percentage of Total Operating Revenues
20-year termination notice147 $2,482 78.7 %
 5-year termination notice6 360 11.4 %
Total153 $2,842 90.1 %
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.