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Debt and Other Obligations Credit Facility Agreements (Details)
3 Months Ended
Dec. 31, 2021
USD ($)
Credit_facilities
Sep. 30, 2021
USD ($)
Line of Credit Facility [Line Items]    
Summary of Long-Term Credit Facilities
The following table provides additional information regarding TVA's funding available under the four long-term revolving credit facilities:
Summary of Long-Term Credit Facilities
At December 31, 2021
(in millions)
Maturity DateFacility LimitLetters of Credit OutstandingCash BorrowingsAvailability
September 2023$1,000 $297 $— $703 
 February 2024150 38 — 112 
February 2025500 500 — — 
September 20261,000 279 — 721 
Total$2,650 $1,114 $— $1,536 
 
Borrowings under U.S. Treasury credit facility $ 0  
Line of Credit    
Line of Credit Facility [Line Items]    
Current borrowing capacity for credit facilities 150,000,000  
Revolving Credit Facilities    
Line of Credit Facility [Line Items]    
Current borrowing capacity for credit facilities $ 2,650,000,000  
Number of revolving credit facilities | Credit_facilities 4  
December 2019 Credit Facility $ 150,000,000  
February 2022 Credit Facility 1,000,000,000  
June 2020 Credit Facility 500,000,000  
September 2020 Credit Facility 1,000,000,000  
Cash Borrowings-December 2019 Credit Facility 0  
Cash Borrowings-June 2020 Credit Facility 0  
Cash Borrowings-September 2020 Credit Facility 0  
Total Cash Borrowings for Credit Facilities 0  
Remaining Availability, December 2019 Credit Facility 112,000,000  
Remaining Availability, February 2022 Credit Facility 703,000,000  
Long-term Line of Credit, Borrowings 3 0  
Remaining Availability, June 2020 Credit Facility 0  
Total Remaining Availability for Credit Facilities 1,536,000,000  
Letter of Credit    
Line of Credit Facility [Line Items]    
Letters of Credit Outstanding, Amount 1 500,000,000  
Letter of Credit Outstanding, December 2019 Credit Facility 38,000,000  
Letter of Credit Outstanding, February 2022 Credit Facility 297,000,000  
Letter of Credit Outstanding, September 2020 Credit Facility 279,000,000  
Amount of letters of credit outstanding for credit facilities $ 1,114,000,000 $ 1,200,000,000