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Property, Plant and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
As of December 31, 2013 and 2012, the components of property, plant and equipment are stated at cost less accumulated depreciation as follows (in millions):
 
2013
 
2012
 
Depreciable Lives
Buildings, machinery and equipment(1)
$
15,838

 
$
14,774

 
3 – 47 Years
Geothermal properties
1,265

 
1,243

 
13 – 59 Years
Other
164

 
142

 
3 – 47 Years
 
17,267

 
16,159

 
 
Less: Accumulated depreciation
4,897

 
4,390

 
 
 
12,370

 
11,769

 
 
Land
103

 
98

 
 
Construction in progress(1)
522

 
1,138

 
 
Property, plant and equipment, net
$
12,995

 
$
13,005

 
 

___________
(1)
The change from December 31, 2012 to December 31, 2013 is primarily attributed to our Russell City and Los Esteros power plants commencing commercial operations during 2013.