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Commitments and Contingencies Commitments and Contingencies - Contingencies (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
USD ($)
Units
reactors
Insurance_layers
Procedures
Sites
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Contingencies      
Nuclear liability insurance $ 375,000    
Assessment from licensees for each licensed reactor $ 127,000    
Number of licensed reactors in US | reactors 102    
Nuclear accident assessment limitation per year per unit $ 19,000    
Number of licensed nuclear units | Units 7    
Maximum assessment per nuclear incident $ 891,000    
Maximum payment required per accident in any one year 133,000    
Total amount of protection available $ 13,000,000    
Surcharge for legal expenses 5.00%    
Number of layers until the U.S. Congress is required to take action | Insurance_layers 2    
Amount of property, decommissioning, and decontamination insurance carried $ 5,100,000    
Amount of insurance available for loss at any one site $ 2,100,000    
Number of sites | Sites 1    
Maximum amount of retrospective premiums $ 132,000    
Maximum idemnity if a covered accident tasks or keeps a nuclear unit offline 490,000    
Maximum amount of retrospective premiums 37,000    
Estimated future decommissioning cost [1] $ 4,052,000 $ 3,843,000 $ 3,169,000
Number of procedures for determining estimates for the costs of nuclear decommissioning | Procedures 2    
Amount spent to reduce emissions since 1970 $ 6,500,000    
Amount spent to reduce emissions 259,000 315,000 378,000
Possible additional future costs for compliance with Clean Air Act requirements 375,000    
Possible additional future costs for compliance with CCR requirements 1,200,000    
Possible additional future costs for compliance with Clean Water requirements. 400,000    
Amount of settlement for potential liability related to soil cleanup 300    
Amount of settlement for potential liability related to EPA study of site 8    
Remaining natural resource damages are less than 0    
Estimated liability for cleanup and similar environmental work on a non-discounted basis 23,000 23,000  
Nuclear      
Contingencies      
Estimated future decommissioning cost 2,492,000 2,187,000 2,052,000
Non-nuclear      
Contingencies      
Estimated future decommissioning cost $ 1,560,000 $ 1,656,000 $ 1,117,000
[1] The current portions of the ARO liability in the amounts of $212 million and $161 million as of September 30, 2016 and 2015, respectively, are included in Accounts payable and accrued liabilities.