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Other Long-Term Liabilities Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Other Long-Term Liabilities    
Interest rate swaps $ 698 $ 840
Currency swap liabilities 115 116 [1]
Operating Lease, Liability, Noncurrent 63 88
Derivative, Fair Value, Net [Abstract]    
EnergyRight financing obligation (74) (74)
Deferred Revenue, Noncurrent 39 48
Non-current regulatory liabilities 141 83
Total other long-term liabilities 1,606 1,712
Finance Lease, Liability 726  
Deferred Compensation Liability, Current (70) (74)
Current portion of energy prepayment obligations 25 28
Fair value 12 64
Long-term debt of variable interest entities (including current maturities) 1,696 966
Long-term project cost accruals 204 140
Environmental Exit Costs, Costs Accrued to Date 274 226
Deferred Compensation Liability, Classified, Noncurrent 54 50
Other Sundry Liabilities 21  
Environmental Remediation    
Derivative, Fair Value, Net [Abstract]    
Environmental Exit Costs, Costs Accrued to Date   14
Other long-term liabilities    
Other Long-Term Liabilities    
Interest rate swaps 643 792
Currency swap liabilities 108 109
Derivative, Fair Value, Net [Abstract]    
EnergyRight financing obligation (53) (52)
Customer Advances for Construction 61 55
Membership interests of VIE subject to mandatory redemption 25 7
Other 70 81
Accounts payable and accrued liabilities    
Derivative, Fair Value, Net [Abstract]    
EnergyRight financing obligation (13) (13)
Customer Advances for Construction 155 60
Long-term project cost accruals 256  
Environmental Exit Costs, Costs Accrued to Date 52 3
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Current $ 17 16
Accounts Payable [Member]    
Derivative, Fair Value, Net [Abstract]    
Long-term project cost accruals   $ 124
[1] See Note 16 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.