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Other Long-Term Liabilities Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Portion at Other than Fair Value Measurement [Member]    
Derivative, Fair Value, Net [Abstract]    
EnergyRight financing obligation $ (69) $ (72)
Long-term debt of variable interest entities (including current maturities) 968 1,007
Interest rate swaps 662 905
Currency swap liabilities 141 240 [1]
EnergyRight financing obligation (81) (81)
Deferred Revenue, Noncurrent 45 39
Non-current regulatory liabilities 107 172
Total other long-term liabilities 1,211 $ 1,485
Finance Lease, Liability $ 632  
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities
Deferred Compensation Liability, Current $ (65) $ (53)
Current portion of energy prepayment obligations 21 16
Fair value 52 1
Long-term debt of variable interest entities (including current maturities) 927 989
Other long-term liabilities    
Other Long-Term Liabilities    
Interest rate swaps 627 851
Currency swap liabilities 131 228
Derivative, Fair Value, Net [Abstract]    
EnergyRight financing obligation (55) (58)
Environmental agreements liability 41 39
Customer Advances for Construction 56 53
Other 111 123
Accounts payable and accrued liabilities    
Derivative, Fair Value, Net [Abstract]    
EnergyRight financing obligation (14) (14)
Customer Advances for Construction $ 39 $ 33
[1] See Note 15 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.