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Commitments and Contingencies Commitments and Contingencies - Contingencies (Details) (USD $)
 12 Months Ended
Sep. 30, 2013
reactors
Procedures
Sites
Areas
Insurance_layers
Phases
Units
Sep. 30, 2012
Sep. 30, 2011
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 4,600,000,000    
Amount of insurance available for loss at any one site 2,100,000,000    
Number of sites 1    
Maximum amount of retrospecitve premiums 105,000,000    
Maximum idemnity if a covered accident tasks or keeps a nuclear unit offline 490,000,000    
Maximum amount of retrospective premiums 32,000,000    
Number of procedures for determining estimates for the costs of nuclear decommissioning 2    
Amount spent to reduce emissions since 1977 5,600,000,000    
Amount spent to reduce emissions 182,000,000 38,000,000 34,000,000
Possible additional future costs for compliance with Clean Air Act requirements 1,300,000,000    
Estimated liability for cleanup and similar environmental work on a non-discounted basis 15,000,000    
Number of areas of cleanup 4    
Number of phases of soil cleanup 2    
Amount of settlement for potential liability related to soil cleanup 300,000    
Cost estimate for first phase of soil cleanup 55,000,000    
Cost estimate for second phase of soil cleanup 10,000,000    
Low end of cleanup estimate 6,000,000    
High end of cleanup estimate 25,000,000    
Remaining natural resource damages are less than 1,000,000    
Percent of Operation and Maintenance Cost 80.00%    
Expected increase (decrease) in operation and maintenance expense 500,000,000    
Nuclear
      
Contingencies      
Future estimated decommissioning cost 2,400,000,000    
Non-nuclear
      
Contingencies      
Future estimated decommissioning cost $ 1,100,000,000