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Regulatory Assets and Liabilities (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Regulatory Assets and Liabilities    
Current regulatory assets $ 110 $ 191
Non-current regulatory assets 9,287 9,408
Environmental Remediation Costs Recognized [Abstract] 215 215
Regulatory assets 9,397 9,599
Current regulatory liabilities 186 174
Regulatory Liability, Noncurrent 78 83
Regulatory Liabilities 264 257
Fair value $ 32 $ 64
Commodity Contract Derivatives    
Regulatory Assets and Liabilities    
Number of contracts 51 45
Derivative, Nonmonetary Notional Amount 508,000,000 321,000,000
Fair value $ 6 $ 2
Fuel cost adjustment tax equivalents    
Regulatory Assets and Liabilities    
Current regulatory liabilities 169 169
Unrealized gains/losses on commodity derivatives    
Regulatory Assets and Liabilities    
Current regulatory liabilities 17 5
Regulatory Liability, Noncurrent 1 2
Postretirement Benefit Costs    
Regulatory Assets and Liabilities    
Regulatory Liability, Noncurrent 77 81
Unrealized losses on interest rate derivatives [Member]    
Regulatory Assets and Liabilities    
Current regulatory assets 46 54
Non-current regulatory assets 282 447
Unrealized gains/losses on commodity derivatives    
Regulatory Assets and Liabilities    
Current regulatory assets 55 102
Non-current regulatory assets 32 64
Fuel cost adjustment receivable/liability    
Regulatory Assets and Liabilities    
Current regulatory assets 9 35
Pension Costs [Member]    
Regulatory Assets and Liabilities    
Non-current regulatory assets 1,959 1,979
Nuclear desommissioning costs [Member]    
Regulatory Assets and Liabilities    
Non-current regulatory assets 440 362
Non-nuclear decommissioning [Member]    
Regulatory Assets and Liabilities    
Non-current regulatory assets 6,202 6,187
Other non-current regulatory assets [Member]    
Regulatory Assets and Liabilities    
Non-current regulatory assets $ 157 $ 154