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Debt - Subsidiary Non-recourse Debt in Default or Accelerated (Details)
$ in Millions
Jun. 30, 2015
USD ($)
Nonrecourse Debt Default [Line Items]  
Debt Default Amount $ 764
Maritza [Member]  
Nonrecourse Debt Default [Line Items]  
Net Assets 612
Kavarna [Member]  
Nonrecourse Debt Default [Line Items]  
Net Assets 78
Altai [Domain]  
Nonrecourse Debt Default [Line Items]  
Net Assets 16
Covenant Violation [Member] | Maritza [Member]  
Nonrecourse Debt Default [Line Items]  
Debt Default, Short-term Debt, Amount 605
Covenant Violation [Member] | Kavarna [Member]  
Nonrecourse Debt Default [Line Items]  
Debt Default, Short-term Debt, Amount 147
Covenant Violation [Member] | Altai [Domain]  
Nonrecourse Debt Default [Line Items]  
Debt Default, Short-term Debt, Amount $ 12