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Property, Plant and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment, Net [Abstract]  
Property, Plant and Equipment
As of December 31, 2015 and 2014, the components of property, plant and equipment are stated at cost less accumulated depreciation as follows (in millions):
 
2015
 
2014
 
Depreciable Lives
Buildings, machinery and equipment
$
16,294

 
$
16,059

 
3 – 47 Years
Geothermal properties
1,319

 
1,294

 
13 – 58 Years
Other
208

 
203

 
3 – 47 Years
 
17,821

 
17,556

 
 
Less: Accumulated depreciation
5,377

 
4,984

 
 
 
12,444

 
12,572

 
 
Land
120

 
120

 
 
Construction in progress
448

 
498

 
 
Property, plant and equipment, net
$
13,012

 
$
13,190