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Commitments and Contingencies Commitments and Contingencies - Contingencies (Details) (USD $)
 12 Months Ended
Sep. 30, 2014
reactors
Procedures
Insurance_layers
Units
Sites
Sep. 30, 2013
Sep. 30, 2012
Contingencies      
Nuclear liability insurance $ 375,000,000    
Assessment from licensees for each licensed reactor 127,000,000    
Number of licensed reactors in US 104    
Nuclear accident assessment limitation per year per unit 19,000,000    
Number of licensed nuclear units 6    
Maximum assessment per nuclear incident 764,000,000    
Maximum payment required per accident in any one year 114,000,000    
Total amount of protection available 13,000,000,000    
Surcharge for legal expenses 5.00%    
The U.S. Congress is required to take action if these layes are exhausted 2    
Amount of property, decommissioning, and decontamination insurance carried 5,100,000,000    
Amount of insurance available for loss at any one site 2,100,000,000    
Number of sites 1    
Maximum amount of retrospective premiums 120,000,000    
Maximum idemnity if a covered accident tasks or keeps a nuclear unit offline 490,000,000    
Maximum amount of retrospective premiums 35,000,000    
Number of procedures for determining estimates for the costs of nuclear decommissioning 2    
Amount spent to reduce emissions since 1970 5,900,000,000    
Amount spent to reduce emissions 378,000,000 197,000,000 55,000,000
Possible additional future costs for compliance with Clean Air Act requirements 900,000,000    
Amount of settlement for potential liability related to soil cleanup 300,000    
Amount of settlement for potential liability related to EPA study of site 8,000    
Remaining natural resource damages are less than 1,000,000    
Estimated liability for cleanup and similar environmental work on a non-discounted basis 15,000,000 15,000,000  
Expected increase (decrease) in operation and maintenance expense (500,000,000)    
Restructuring and Related Cost, Number of Positions Eliminated 2,000    
Severance cost liability 45,000,000 0  
Nuclear
      
Contingencies      
Future estimated decommissioning cost 2,100,000,000    
Non-nuclear
      
Contingencies      
Future estimated decommissioning cost $ 1,100,000,000