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Commitments and Contingencies Commitments and Contingencies - Table (Details)
 1 Months Ended 12 Months Ended
Oct. 31, 2007
Legal_actions
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Obligations      
Term of payments for civil penalty   3 years  
Accrual for Environmental Loss Contingencies, Gross   $ 23,000,000 $ 15,000,000
Number of claims dismissed related to NPDES permit   7  
Number of claims filed on Gallatin NPDES permit   8  
Number of reactors a COL was submitted for | Legal_actions 2    
Periodforcommitmentsandcontingenciesshown   5 years  
Total   $ 9,000,000 18,000,000
2016   100,000,000  
2017   100,000,000  
2018   100,000,000  
2019   10,000,000  
2020   0  
Thereafter   0  
Total   310,000,000  
CT and QTE outstanding leaseback obligation   616,000,000 $ 691,000,000
Plaintiff civil penalties related to Gallatin   37,500  
Membership interest of variable interest entity subject to mandatory redemption      
Obligations      
2016   2,000,000  
2017   2,000,000  
2018   2,000,000  
2019   2,000,000  
2020   3,000,000  
Thereafter   26,000,000  
Total   37,000,000  
Lease Obligations - Capital      
Obligations      
2016   13,000,000  
2017   13,000,000  
2018   13,000,000  
2019   12,000,000  
2020   12,000,000  
Thereafter   156,000,000  
Total   219,000,000  
Lease Obligations - Non-Cancelable Operating      
Obligations      
2016   44,000,000  
2017   42,000,000  
2018   32,000,000  
2019   25,000,000  
2020   25,000,000  
Thereafter   38,000,000  
Total   206,000,000  
Purchase Obligations - Power      
Obligations      
2016   217,000,000  
2017   226,000,000  
2018   229,000,000  
2019   235,000,000  
2020   241,000,000  
Thereafter   3,124,000,000  
Total   4,272,000,000  
Purchase Obligations - Fuel      
Obligations      
2016   1,282,000,000  
2017   711,000,000  
2018   635,000,000  
2019   508,000,000  
2020   335,000,000  
Thereafter   1,448,000,000  
Total   4,919,000,000  
Purchase Obligations - Other      
Obligations      
2016   262,000,000  
2017   198,000,000  
2018   193,000,000  
2019   189,000,000  
2020   173,000,000  
Thereafter   1,830,000,000  
Total   2,845,000,000  
Unfunded Loan Commitment [Member]      
Obligations      
2016   5,000,000  
Total   5,000,000  
Payments on Other Financings      
Obligations      
2016   104,000,000  
2017   104,000,000  
2018   104,000,000  
2019   96,000,000  
2020   73,000,000  
Thereafter   232,000,000  
Total   713,000,000  
Total      
Obligations      
2016   1,929,000,000  
2017   1,296,000,000  
2018   1,208,000,000  
2019   1,067,000,000  
2020   862,000,000  
Thereafter   6,854,000,000  
Total   $ 13,216,000,000