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Other Long-Term Liabilities Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Other Long-Term Liabilities    
Interest rate swaps $ 840 $ 662
Currency swap liabilities 116 141 [1]
Operating Lease, Liability, Noncurrent 88 93
Derivative, Fair Value, Net [Abstract]    
EnergyRight financing obligation (74) (81)
Deferred Revenue, Noncurrent 48 45
Non-current regulatory liabilities 83 107
Total other long-term liabilities 1,712 1,211
Finance Lease, Liability 780  
Deferred Compensation Liability, Current (74) (65)
Current portion of energy prepayment obligations 28 21
Fair value 64 52
Long-term debt of variable interest entities (including current maturities) 966 927
Long-term project cost accruals 140 10
Environmental Exit Costs, Costs Accrued to Date 212 0
Deferred Compensation Liability, Classified, Noncurrent 50 41
Other long-term liabilities    
Other Long-Term Liabilities    
Interest rate swaps 792 627
Currency swap liabilities 109 131
Derivative, Fair Value, Net [Abstract]    
EnergyRight financing obligation (52) (55)
Customer Advances for Construction 55 56
Other 102 101
Accounts payable and accrued liabilities    
Derivative, Fair Value, Net [Abstract]    
EnergyRight financing obligation (13) (14)
Customer Advances for Construction 60 39
Long-term project cost accruals 124  
Environmental Exit Costs, Costs Accrued to Date $ 3 0
Accounts Payable [Member]    
Derivative, Fair Value, Net [Abstract]    
Long-term project cost accruals   $ 14
[1] See Note 15 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.