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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Sep. 30, 2023
Other Long-Term Liabilities    
Deferred Revenue, Noncurrent $ 46 $ 45
Interest Rate Derivative Liabilities, at Fair Value 818 662
Operating Lease, Liability, Noncurrent 163 93
Currency swap liabilities [1] 121 141
Fair value 98 52
EnergyRight® financing obligation (81) (81)
Deferred Compensation Liability, Classified, Noncurrent 32 41
Other long-term liabilities 1,488 1,211
Regulatory Liability, Noncurrent 103 107
Deferred Compensation Liability, Current 32 65
Deferred Revenue, Current 23 21
Operating Lease, Liability, Current 81 71
Operating Lease, Liability, Current 81 71
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
EnergyRight® financing obligation (14) (14)
Customer Advances for Construction 60 39
Other long-term liabilities    
Other Long-Term Liabilities    
Interest Rate Derivative Liabilities, at Fair Value 782 627
Currency swap liabilities 112 131
EnergyRight® financing obligation (55) (55)
Other 154 111
Customer Advances for Construction $ 46 $ 56
[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.