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Contingencies and Legal Proceedings Contingencies (Details)
 9 Months Ended
Jun. 30, 2023
USD ($)
reactors
Procedures
Insurance_layers
Sep. 30, 2022
USD ($)
Loss Contingencies    
Nuclear liability insurance $ 450,000,000  
Assessment from licensees for each licensed reactor $ 138,000,000  
Number of licensed reactors in US | reactors 96  
Nuclear accident assessment limitation per year per unit $ 20,000,000  
Maximum assessment per nuclear incident 963,000,000  
Total amount of protection available 13,700,000,000  
Amount of insurance available for loss at any one site 2,100,000,000  
Maximum amount of retrospective premiums 114,000,000  
Maximum idemnity if a covered accident takes or keeps a nuclear unit offline 490,000,000  
Maximum retrospective premiums 44,000,000  
Estimated future decommissioning cost $ 7,122,000,000 $ 7,162,000,000
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 $ 231,000,000  
Possible additional future costs for compliance with CCR requirements 711,000,000  
Possible additional future costs for compliance with Clean Water requirements. 48,000,000  
Estimated liability for cleanup and environmental work 16 17,000,000
Amount of insurance available for loss at any one site (top range) 2,800,000,000  
Long-term debt of VIEs, net (including current maturities) 988,000,000 989,000,000
Legal loss contingency accrual $ 28,000,000  
The U.S. Congress is required to take action if these layes are exhausted | Insurance_layers 2  
Nuclear    
Loss Contingencies    
Estimated future decommissioning cost $ 3,773,000,000 3,643,000,000
Non-nuclear    
Loss Contingencies    
Estimated future decommissioning cost $ 3,349,000,000 $ 3,519,000,000