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Debt - Subsidiary Non-recourse Debt in Default or Accelerated (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Nonrecourse Debt Default [Line Items]  
Debt Default Amount $ 896
Maritza [Member]
 
Nonrecourse Debt Default [Line Items]  
Net Assets 569
Kavarna [Member]
 
Nonrecourse Debt Default [Line Items]  
Net Assets 78
Covenant Violation [Member] | Maritza [Member]
 
Nonrecourse Debt Default [Line Items]  
Debt Default Amount 720
Covenant Violation [Member] | Kavarna [Member]
 
Nonrecourse Debt Default [Line Items]  
Debt Default Amount $ 176