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Debt (Subsidiary Non-Recourse Debt in Default or Accelerated) (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Debt Details [Line Items]  
Debt default amount $ 1,038
Maritza (Bulgaria)  
Debt Details [Line Items]  
Net assets 657
Maritza (Bulgaria) | Covenant Violation  
Debt Details [Line Items]  
Debt default amount 559
Sul Subsidiary [Member] | Covenant Violation  
Debt Details [Line Items]  
Debt default amount 333
Net assets 439
Kavarna (Bulgaria) | Covenant Violation  
Debt Details [Line Items]  
Debt default amount 140
Net assets 74
Sogrinsk [Member] | Covenant Violation  
Debt Details [Line Items]  
Debt default amount 6
Net assets $ 8