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Basis of Presentation and Summary of Significant Accounting Policies Property, Plant and Equipment, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Buildings, machinery and equipment $ 16,204 $ 16,059
Geothermal properties 1,315 1,294
Other 209 203
Property, plant and equipment, gross 17,728 17,556
Less: Accumulated depreciation 5,245 4,984
Property, plant and equipment, gross, less accumulated depreciation, depletion and amortization 12,483 12,572
Land 120 120
Construction in progress 381 498
Property, plant and equipment, net $ 12,984 $ 13,190