v3.4.0.3
Basis of Presentation and Summary of Significant Accounting Policies Property, Plant and Equipment, Net (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Buildings, machinery and equipment $ 16,685 $ 16,294
Geothermal properties 1,327 1,319
Other 219 208
Property, plant and equipment, gross 18,231 17,821
Less: Accumulated depreciation 5,491 5,377
Property, plant and equipment, gross, less accumulated depreciation, depletion and amortization 12,740 12,444
Land 121 120
Construction in progress 546 448
Property, plant and equipment, net $ 13,407 $ 13,012