v2.4.0.6

Property, Plant and Equipment, Net (Tables) | 12 Months Ended
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Dec. 31, 2012
Property, Plant and Equipment, Net [Abstract] |
Components of Property, Plant and Equipment | As of December 31, 2012 and 2011, the components of property, plant and equipment, are stated at cost less accumulated depreciation as follows (in millions):
| 2012 |  | 2011 |  | Depreciable Lives
Buildings, machinery and equipment | $ | 14,774 |  |  | $ | 15,074 |  |  | 3 – 47 Years
Geothermal properties | 1,243 |  |  | 1,163 |  |  | 13 – 59 Years
Other | 142 |  |  | 156 |  |  | 3 – 47 Years
| 16,159 |  |  | 16,393 |  |  |
Less: Accumulated depreciation | 4,390 |  |  | 4,158 |  |  |
| 11,769 |  |  | 12,235 |  |  |
Land | 98 |  |  | 91 |  |  |
Construction in progress | 1,138 |  |  | 693 |  |  |
Property, plant and equipment, net | $ | 13,005 |  |  | $ | 13,019 |  |  |

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