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Contingencies and Legal Proceedings Contingencies (Details)
$ in Millions
 3 Months Ended
Dec. 31, 2016
reactors
Dec. 31, 2016
Units
Dec. 31, 2016
USD ($)
Dec. 31, 2016
Insurance_layers
Dec. 31, 2016
Procedures
Dec. 31, 2016
Sites
Sep. 30, 2016
USD ($)
Loss Contingencies              
Nuclear liability insurance     $ 375        
Assessment from licensees for each licensed reactor     127        
Number of licensed reactors in US | reactors 102            
Nuclear accident assessment limitation per year per unit     19        
Number of licensed nuclear units | Units   7          
Maximum assessment per nuclear incident     891        
Maximum payment required per accident in any one year     133        
Total amount of protection available     13,000        
Surcharge for legal expenses 5.00%            
Number of layers before Congress is required to take action | Insurance_layers       2      
Amount of property, decommissioning, and decontamination insurance carried     5,100        
Amount of insurance available for loss at any one site     2,100        
Number of sites 2         1  
Maximum amount of retrospective premiums     132        
Maximum idemnity if a covered accident takes or keeps a nuclear unit offline     490        
Maximum retrospective premiums     37        
Estimated future decommissioning cost     4,081 [1]       $ 4,052
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     335        
Possible additional future costs for compliance with CCR requirements     1,200        
Possible additional future costs for compliance with Clean Water requirements.     400        
Total amount liability settled for             0
Estimated liability for cleanup and environmental work     22       23
Nuclear              
Loss Contingencies              
Estimated future decommissioning cost     2,521       2,492
Non-nuclear              
Loss Contingencies              
Estimated future decommissioning cost     $ 1,560       $ 1,560
[1] The current portion of ARO in the amount of $200 million and $212 million is included in Accounts payable and accrued liabilities at December 31, 2016, and September 30, 2016, respectively.