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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Sep. 30, 2022
Other Long-Term Liabilities    
Pipeline financing obligation $ 32 $ 39
Deferred Revenue, Noncurrent 40 39
Interest Rate Derivative Liabilities, at Fair Value 951 905
Operating Lease, Liability, Noncurrent 67 93
Currency swap liabilities [1] 166 240
EnergyRight® financing obligation (80) (81)
Other long-term liabilities 1,467 1,485
Regulatory Liability, Noncurrent 68 172
Deferred Compensation Liability, Current 41 53
Deferred Revenue, Current 20 16
Operating lease liability [Member]    
Other Long-Term Liabilities    
Accounts Payable and Accrued Liabilities 60 59
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
Interest Rate Derivative Liabilities, at Fair Value 41 54
EnergyRight® financing obligation (14) (14)
Customer Advances for Construction 55 33
Other long-term liabilities    
Other Long-Term Liabilities    
Interest Rate Derivative Liabilities, at Fair Value 910 851
Currency swap liabilities 156 228
EnergyRight® financing obligation (57) (58)
Other 161 124
Customer Advances for Construction 44 53
Other Current Liabilities    
Other Long-Term Liabilities    
Currency swap liabilities $ 10 $ 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.