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Contingencies and Legal Proceedings Contingencies (Details)
$ in Millions
 6 Months Ended
Mar. 31, 2020
USD ($)
reactors
Procedures
Sep. 30, 2019
USD ($)
Loss Contingencies    
Nuclear liability insurance $ 450  
Assessment from licensees for each licensed reactor $ 138  
Number of licensed reactors in US | reactors 97  
Nuclear accident assessment limitation per year per unit $ 20  
Maximum assessment per nuclear incident 963  
Total amount of protection available 13,800  
Amount of insurance available for loss at any one site 2,100  
Maximum amount of retrospective premiums 139  
Maximum idemnity if a covered accident takes or keeps a nuclear unit offline 490  
Maximum retrospective premiums 46  
Estimated future decommissioning cost $ 5,775 $ 5,616
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 1,053  
Possible additional future costs for compliance with Clean Water requirements. 238  
Estimated liability for cleanup and environmental work 12 15
Nuclear    
Loss Contingencies    
Estimated future decommissioning cost 3,206 3,136
Non-nuclear    
Loss Contingencies    
Estimated future decommissioning cost 2,569 $ 2,480
Environmental Agreements    
Loss Contingencies    
Amount to be provided to fund environmental projects $ 279