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Property, Plant and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2011
Property, Plant and Equipment, Net [Abstract]  
Components of Property, Plant and Equipment
As of December 31, 2011 and 2010, the components of property, plant and equipment, are stated at cost less accumulated depreciation as follows (in millions):
 
2011
 
2010
Buildings, machinery and equipment
$
15,074

 
$
14,669

Geothermal properties
1,163

 
1,102

Other
156

 
182

 
16,393

 
15,953

Less: Accumulated depreciation
4,158

 
3,690

 
12,235

 
12,263

Land
91

 
93

Construction in progress
693

 
622

Property, plant and equipment, net
$
13,019

 
$
12,978