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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Sep. 30, 2023
Other Long-Term Liabilities    
Deferred Revenue, Noncurrent $ 47 $ 45
Environmental Remediation Costs Recognized Disclosure    
Interest Rate Derivative Liabilities, at Fair Value 753 662
Operating Lease, Liability, Noncurrent 113 93
Currency swap liabilities [1] 125 141
Fair value 80 52
Environmental Exit Costs, Anticipated Cost (59) 0
EnergyRight® financing obligation (79) (81)
Deferred Compensation Liability, Classified, Noncurrent 38 41
Other long-term liabilities 1,436 1,211
Regulatory Liability, Noncurrent 94 107
Deferred Compensation Liability, Current 51 65
Deferred Revenue, Current 24 21
Long-term project cost accruals 54 10
Operating Lease, Liability, Current 63 71
Operating Lease, Liability, Current 63 71
Accounts payable and accrued liabilities    
Environmental Remediation Costs Recognized Disclosure    
Environmental Exit Costs, Anticipated Cost (3) 0
EnergyRight® financing obligation (14) (14)
Customer Advances for Construction 56 39
Other long-term liabilities    
Environmental Remediation Costs Recognized Disclosure    
Interest Rate Derivative Liabilities, at Fair Value 717 627
Currency swap liabilities 116 131
EnergyRight® financing obligation (53) (55)
Other 101 101
Customer Advances for Construction 58 56
Accounts Payable    
Environmental Remediation Costs Recognized Disclosure    
Long-term project cost accruals $ 40 $ 14
[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.