v3.3.1.900
Property, Plant and Equipment, Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Buildings, machinery and equipment $ 16,294 $ 16,059  
Geothermal properties 1,319 1,294  
Other 208 203  
Property, Plant and Equipment, Gross 17,821 17,556  
Less: Accumulated depreciation 5,377 4,984  
Property, Plant and Equipment, Gross, Less Accumulated Depreciation 12,444 12,572  
Land 120 120  
Construction in progress 448 498  
Property, plant and equipment, net 13,012 13,190  
Depreciation 595 591 $ 584
Interest Costs, Capitalized During Period $ 15 $ 19 $ 38
Building, Machinery and Equipment, Gross [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 3 years    
Building, Machinery and Equipment, Gross [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 47 years    
Geothermal Properties, Gross [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 13 years    
Geothermal Properties, Gross [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 58 years    
Property, Plant and Equipment, Other Types [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 3 years    
Property, Plant and Equipment, Other Types [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives 47 years