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Basis of Presentation and Summary of Significant Accounting Policies Property, Plant and Equipment, Net (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Buildings, machinery and equipment $ 16,516 [1] $ 15,838 [1]
Geothermal properties 1,267 1,265
Other 167 164
Property, Plant and Equipment, Gross 17,950 17,267
Less: Accumulated depreciation 5,046 4,897
Property, Plant and Equipment, Gross, Less Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 12,904 12,370
Land 109 103
Construction in progress 585 522
Property, plant and equipment, net $ 13,598 $ 12,995
[1] (1)The change from December 31, 2013 to March 31, 2014 can primarily be attributed to our acquisition of Guadalupe Energy Center on February 26, 2014.