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Contingencies and Legal Proceedings Contingencies (Details)
$ in Millions
 9 Months Ended
Jun. 30, 2022
USD ($)
Insurance_layers
Procedures
reactors
Sep. 30, 2021
USD ($)
Loss Contingencies    
Nuclear liability insurance $ 450  
Assessment from licensees for each licensed reactor $ 138  
Number of licensed reactors in US | reactors 95  
Nuclear accident assessment limitation per year per unit $ 20  
Maximum assessment per nuclear incident 963  
Total amount of protection available 13,500  
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 $ 7,211 $ 7,002
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 $ 124  
Possible additional future costs for compliance with CCR requirements 1,000  
Possible additional future costs for compliance with Clean Water requirements. 128  
Estimated liability for cleanup and environmental work 18 18
Amount of insurance available for loss at any one site (top range) 2,800  
Long-term debt of VIEs, net (including current maturities) $ 1,074 1,307
The U.S. Congress is required to take action if these layes are exhausted | Insurance_layers 2  
Nuclear    
Loss Contingencies    
Estimated future decommissioning cost $ 3,545 3,428
Non-nuclear    
Loss Contingencies    
Estimated future decommissioning cost 3,666 $ 3,574
Environmental Agreements    
Loss Contingencies    
Amount invested in certain environmental projects 282  
General    
Loss Contingencies    
Legal loss contingency accrual $ 11