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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Oct. 01, 2019
Sep. 30, 2019
Amounts Recognized on TVA's Consolidated Balance Sheet [Line Items]            
Finance Lease, Liability, Payments, Due Thereafter $ 418   $ 418     $ 418
Operating lease assets, net of amortization 354   354      
Finance lease, asset 140   140      
Lease assets 494   494      
Operating Lease, Liability, Current 101   101     0
Finance Lease, Liability, Current 6   6      
Operating Lease, Liability, Noncurrent 262   262      
Finance Lease, Liability, Noncurrent 179   179      
Lease liabilities 548   548      
Purchased Power Lease     89      
Finance Lease, Liability, Payment, Due 657   657     $ 683
Operating Lease, Asset         $ 205  
Operating Lease, Liability         $ 210  
Short-term Lease, Cost $ 3   $ 3      
Operating Leases, Rent Expense   $ 18   $ 36