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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Other Long-Term Liabilities    
Deferred Revenue, Noncurrent $ 48 $ 45
Environmental Remediation Costs Recognized Disclosure    
Interest Rate Derivative Liabilities, at Fair Value 692 662
Operating Lease, Liability, Noncurrent 103 93
Currency swap liabilities [1] 124 141
Fair value 59 52
Environmental Exit Costs, Anticipated Cost (165) 0
EnergyRight® financing obligation (77) (81)
Deferred Compensation Liability, Classified, Noncurrent 45 41
Other long-term liabilities 1,490 1,211
Regulatory Liability, Noncurrent 91 107
Deferred Compensation Liability, Current 66 65
Deferred Revenue, Current 24 21
Long-term project cost accruals 101 10
Operating Lease, Liability, Current 60 71
Operating Lease, Liability, Current 60 71
Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value 14 31
Accounts payable and accrued liabilities    
Environmental Remediation Costs Recognized Disclosure    
Environmental Exit Costs, Anticipated Cost (4) 0
EnergyRight® financing obligation (13) (14)
Customer Advances for Construction 68 39
Accounts payable and accrued liabilities | Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value (2) (1)
Other long-term liabilities    
Environmental Remediation Costs Recognized Disclosure    
Interest Rate Derivative Liabilities, at Fair Value 658 627
Currency swap liabilities 116 131
EnergyRight® financing obligation (52) (55)
Other 94 101
Customer Advances for Construction 49 56
Other long-term liabilities | Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value (2) (1)
Accounts Payable    
Environmental Remediation Costs Recognized Disclosure    
Long-term project cost accruals 77 14
Other long-term assets | Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value $ 9 $ 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.