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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Sep. 30, 2021
Other Long-Term Liabilities    
Pipeline financing obligation $ 35 $ 42
Deferred Revenue, Noncurrent 39 37
Interest Rate Derivative Liabilities, at Fair Value 1,074 1,639
Operating Lease, Liability, Noncurrent 111 122
Currency swap liabilities [1] 133 83
EnergyRight® financing obligation (82) (92)
Other long-term liabilities 1,560 2,041
Regulatory Liability, Noncurrent 88 40
Deferred Compensation Liability, Current 46 51
Deferred Revenue, Current 14 17
Other Sundry Liabilities   19
Deferred Revenue   5
Operating lease liability [Member]    
Other Long-Term Liabilities    
Accounts Payable and Accrued Liabilities 60 40
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
Obligations under long-term service agreements (38) (28)
Interest Rate Derivative Liabilities, at Fair Value 72 115
EnergyRight® financing obligation (15) (16)
Customer Advances for Construction 35 38
Other long-term liabilities    
Other Long-Term Liabilities    
Obligations under long-term service agreements (9) (29)
Interest Rate Derivative Liabilities, at Fair Value 1,002 1,524
Currency swap liabilities 123 76
EnergyRight® financing obligation (58) (66)
Other 133 121
Customer Advances for Construction 50 24
Other Current Liabilities    
Other Long-Term Liabilities    
Currency swap liabilities $ 10 $ 7
[1] TVA records currency swaps net of cash collateral received from or paid to the counterparty, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 14 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.