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Revenue Local Power Company Contracts (Tables)
 3 Months Ended
Dec. 31, 2019
Long-term Contract for Purchase of Electric Power [Line Items]  
Long-term Contracts or Programs Disclosure [Text Block]
The number of LPCs with the contract arrangements described below, the revenues derived from such arrangements for the three months ended December 31, 2019, and the percentage of TVA's total operating revenues for the three months ended December 31, 2019 represented by these revenues are summarized in the tables below:
TVA Local Power Company Contracts
At and for the Three Months Ended December 31, 2019
Contract Arrangements(1)
 
Number of LPCs
 
Revenue from Sales of Electricity to LPCs
(in millions)
 
Percentage of Total Operating Revenues
20-year termination notice
 
134

 
$
1,471

 
57.1
%
10-year termination notice
 
4

 
214

 
8.3

 5-year termination notice
 
16

 
672

 
26.1

Total
 
154

 
$
2,357

 
91.5
%
Note
(1) Ordinarily, the LPCs and TVA have the same termination notice period; however, in contracts with three of the LPCs with five-year termination notices, 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.