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Legal Proceedings Contingencies (Details) (USD $)
 3 Months Ended
Dec. 31, 2013
reactors
Insurance_layers
Procedures
Units
Sites
Loss Contingencies [Line Items]  
Nuclear liability insurance $ 375,000,000
Number of sites 1
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
Maximum amount of retrospecitve premiums 105,000,000
Maximum idemnity if a covered accident tasks or keeps a nuclear unit offline 490,000,000
Retrospective premiums 32,000,000
Number of procedures for determining estimates for the costs of nuclear decommissioning 2
Possible additional future costs for compliance with Clean Air Act requirements 1,200,000,000
Accrual for Environmental Loss Contingencies, Gross 16,000,000
Nuclear [Member]
  
Loss Contingencies [Line Items]  
Decommissioning Liability, Noncurrent 2,400,000,000
Non-nuclear [Member]
  
Loss Contingencies [Line Items]  
Decommissioning Liability, Noncurrent $ 1,100,000,000