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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Sep. 30, 2024
Other Long-Term Liabilities    
Deferred Revenue, Noncurrent $ 38 $ 48
Environmental Remediation Costs Recognized Disclosure    
Interest Rate Derivative Liabilities, at Fair Value 707 840
Operating Lease, Liability, Noncurrent 80 88
Currency swap liabilities [1] 139 116
Fair value 13 64
Environmental Exit Costs, Anticipated Cost (247) (212)
EnergyRight® financing obligation (73) (74)
Deferred Compensation Liability, Classified, Noncurrent 41 50
Other long-term liabilities 1,551 1,712
Regulatory Liability, Noncurrent 81 83
Deferred Compensation Liability, Current 44 74
Deferred Revenue, Current 41 28
Long-term project cost accruals 181 140
Operating Lease, Liability, Current 65 63
Operating Lease, Liability, Current 65 63
Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value 5 2
Accounts payable and accrued liabilities    
Environmental Remediation Costs Recognized Disclosure    
Environmental Exit Costs, Anticipated Cost (28) (3)
EnergyRight® financing obligation (13) (13)
Customer Advances for Construction 105 60
Accounts payable and accrued liabilities | Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value (2) (3)
Other long-term liabilities    
Environmental Remediation Costs Recognized Disclosure    
Interest Rate Derivative Liabilities, at Fair Value 657 792
Currency swap liabilities 131 109
EnergyRight® financing obligation (52) (52)
Other 89 102
Customer Advances for Construction 22 55
Other long-term liabilities | Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value (3) (2)
Accounts Payable    
Environmental Remediation Costs Recognized Disclosure    
Long-term project cost accruals $ 213 124
Other long-term assets | Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value   $ 2
[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.