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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Sep. 30, 2022
Other Long-Term Liabilities    
Pipeline financing obligation $ 42 $ 39
Deferred Revenue, Noncurrent 41 39
Interest Rate Derivative Liabilities, at Fair Value 837 905
Operating Lease, Liability, Noncurrent 92 93
Currency swap liabilities [1] 161 240
Fair value 78 1
EnergyRight® financing obligation (78) (81)
Other long-term liabilities 1,425 1,485
Regulatory Liability, Noncurrent 59 172
Deferred Compensation Liability, Current 56 53
Deferred Revenue, Current 11 16
Operating lease liability [Member]    
Other Long-Term Liabilities    
Accounts Payable and Accrued Liabilities 66 59
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
Interest Rate Derivative Liabilities, at Fair Value 32 54
EnergyRight® financing obligation (14) (14)
Customer Advances for Construction 53 33
Other long-term liabilities    
Other Long-Term Liabilities    
Interest Rate Derivative Liabilities, at Fair Value 805 851
Currency swap liabilities 153 228
EnergyRight® financing obligation (55) (58)
Other 108 123
Customer Advances for Construction 51 53
Other Current Liabilities    
Other Long-Term Liabilities    
Currency swap liabilities $ 8 $ 12
[1] TVA records currency swaps net of cash collateral received from or paid to the counterparty if applicable, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 13 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.