Basis of Presentation and Summary of Significant Accounting Policies Property, Plant and Equipment, Net (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Buildings, machinery and equipment	$ 15,613	$ 15,838
Geothermal properties	1,271	1,265
Other	172	164
Property, Plant and Equipment, Gross	17,056	17,267
Less: Accumulated depreciation	4,704	4,897
Property, Plant and Equipment, Gross, Less Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	12,352	12,370
Land	109	103
Construction in progress	383	522
Property, plant and equipment, net	$ 12,844	$ 12,995