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Contingencies and Legal Proceedings Contingencies (Details)
$ in Millions
 3 Months Ended
Dec. 31, 2022
USD ($)
reactors
Procedures
Insurance_layers
Sep. 30, 2022
USD ($)
Loss Contingencies    
Nuclear liability insurance $ 450  
Assessment from licensees for each licensed reactor $ 138  
Number of licensed reactors in US | reactors 96  
Nuclear accident assessment limitation per year per unit $ 20  
Maximum assessment per nuclear incident 963  
Total amount of protection available 13,700  
Amount of insurance available for loss at any one site 2,100  
Maximum amount of retrospective premiums 115  
Maximum idemnity if a covered accident takes or keeps a nuclear unit offline 490  
Maximum retrospective premiums 44  
Estimated future decommissioning cost $ 7,155 $ 7,162
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 $ 284  
Possible additional future costs for compliance with CCR requirements 835  
Possible additional future costs for compliance with Clean Water requirements. 96  
Estimated liability for cleanup and environmental work 17 17
Amount of insurance available for loss at any one site (top range) 2,800  
Long-term debt of VIEs, net (including current maturities) $ 1,009 989
The U.S. Congress is required to take action if these layes are exhausted | Insurance_layers 2  
Nuclear    
Loss Contingencies    
Estimated future decommissioning cost $ 3,687 3,643
Non-nuclear    
Loss Contingencies    
Estimated future decommissioning cost $ 3,468 $ 3,519