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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Other Long-Term Liabilities    
Pipeline financing obligation $ 33 $ 42
Deferred Revenue, Noncurrent 38 37
Interest Rate Derivative Liabilities, at Fair Value 1,368 1,639
Operating Lease, Liability, Noncurrent 120 122
Currency swap liabilities [1] 93 83
EnergyRight® financing obligation (85) (92)
Other long-term liabilities 1,801 2,041
Regulatory Liability, Noncurrent 53 40
Deferred Compensation Liability, Current 39 51
Deferred Revenue, Current 15 17
Other Sundry Liabilities   19
Deferred Revenue   5
Operating lease liability [Member]    
Other Long-Term Liabilities    
Accounts Payable and Accrued Liabilities 58 40
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
Obligations under long-term service agreements (31) (28)
Interest Rate Derivative Liabilities, at Fair Value 95 115
EnergyRight® financing obligation (15) (16)
Customer Advances for Construction 36 38
Other long-term liabilities    
Other Long-Term Liabilities    
Obligations under long-term service agreements (17) (29)
Interest Rate Derivative Liabilities, at Fair Value 1,273 1,524
Currency swap liabilities 85 76
EnergyRight® financing obligation (61) (66)
Other 132 121
Customer Advances for Construction 42 24
Other Current Liabilities    
Other Long-Term Liabilities    
Currency swap liabilities $ 8 $ 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.