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Contingencies and Legal Proceedings Contingencies (Details)
$ in Millions
 3 Months Ended
Dec. 31, 2023
USD ($)
Procedures
Insurance_layers
reactors
Sep. 30, 2023
USD ($)
Loss Contingencies    
Nuclear liability insurance $ 450  
Assessment from licensees for each licensed reactor $ 166  
Number of licensed reactors in US | reactors 95  
Nuclear accident assessment limitation per year per unit $ 25  
Maximum assessment per nuclear incident 1,200  
Total amount of protection available 16,200  
Amount of insurance available for loss at any one site 2,100  
Maximum amount of retrospective premiums 114  
Maximum idemnity if a covered accident takes or keeps a nuclear unit offline 490  
Maximum retrospective premiums 44  
Estimated future decommissioning cost $ 7,570 $ 7,489
Number of procedures for determining estimates for the costs of nuclear decommissioning | Procedures 2  
Possible additional future costs for compliance with Clean Air Act requirements $ 228  
Possible additional future costs for compliance with CCR requirements 1,600  
Possible additional future costs for compliance with Clean Water requirements. 197  
Estimated liability for cleanup and environmental work   16
Amount of insurance available for loss at any one site (top range) 2,800  
Long-term debt of VIEs, net (including current maturities) $ 987 927
The U.S. Congress is required to take action if these layes are exhausted | Insurance_layers 2  
Environmental Remediation    
Loss Contingencies    
Accrual for Environmental Loss Contingencies, Significant Assumptions 26 million  
Accrual for Environmental Loss Contingencies, Significant Assumptions 26 million  
Nuclear    
Loss Contingencies    
Estimated future decommissioning cost $ 3,847 3,808
Non-nuclear    
Loss Contingencies    
Estimated future decommissioning cost $ 3,723 $ 3,681