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Asset Impairment Expense (Tables)
9 Months Ended
Sep. 30, 2013
Impairment or Disposal of Tangible Assets Disclosure [Abstract]  
Details of Impairment of Long-Lived Assets Held and Used by Asset
 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
 
2013
 
2012
 
2013
 
2012
 
 
(in millions)
Poland wind projects
 
$
65

 
$

 
$
65

 
$

Beaver Valley
 

 

 
46

 

Itabo (San Lorenzo)
 
15

 

 
15

 

Wind turbines and projects
 

 
36

 

 
40

Kelanitissa
 

 
5

 

 
17

St. Patrick
 

 

 

 
11

Other
 
1

 
2

 
3

 
3

Total asset impairment expense
 
$
81

 
$
43

 
$
129

 
$
71