v3.25.2
Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 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 673 840
Operating Lease, Liability, Noncurrent 74 88
Currency swap liabilities [1] 91 116
Fair value 8 64
Environmental Exit Costs, Anticipated Cost (272) (212)
EnergyRight® financing obligation (73) (74)
Deferred Compensation Liability, Classified, Noncurrent 47 50
Other long-term liabilities 1,507 1,712
Regulatory Liability, Noncurrent 85 83
Deferred Compensation Liability, Current 57 74
Deferred Revenue, Current 42 28
Long-term project cost accruals 198 140
Operating Lease, Liability, Current 56 63
Operating Lease, Liability, Current 56 63
Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value 1 2
Accounts payable and accrued liabilities    
Environmental Remediation Costs Recognized Disclosure    
Environmental Exit Costs, Anticipated Cost (41) (3)
EnergyRight® financing obligation (13) (13)
Customer Advances for Construction 127 60
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Current 11 16
Accounts payable and accrued liabilities | Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value (3) (3)
Other long-term liabilities    
Other Long-Term Liabilities    
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent 20 7
Environmental Remediation Costs Recognized Disclosure    
Interest Rate Derivative Liabilities, at Fair Value 622 792
Currency swap liabilities 85 109
EnergyRight® financing obligation (52) (52)
Other 76 95
Customer Advances for Construction 15 55
Other long-term liabilities | Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value (2) (2)
Accounts Payable    
Environmental Remediation Costs Recognized Disclosure    
Long-term project cost accruals $ 219 124
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.