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Summary of Significant Accounting Policies Property, Plant and Equipment, Net (Details) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2012
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Dec. 31, 2011
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|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Buildings, machinery and equipment | $ 15,150 | $ 15,074 |
| Geothermal properties | 1,212 | 1,163 |
| Other | 158 | 156 |
| Property, Plant and Equipment, Gross | 16,520 | 16,393 |
| Less: Accumulated depreciation | 4,518 | 4,158 |
| Property, Plant and Equipment, Gross, Less Accumulated Depreciation | 12,002 | 12,235 |
| Land | 91 | 91 |
| Construction in progress | 1,036 | 693 |
| Property, plant and equipment, net | $ 13,129 | $ 13,019 |
| X | ||||||||||
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- Definition
Buildings, machinery and equipment, gross No definition available.
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| X | ||||||||||
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- Definition
Geothermal Properties, Gross No definition available.
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| X | ||||||||||
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- Definition
-- None. No documentation exists for this element. -- No definition available.
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| X | ||||||||||
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- Definition
The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This element represents capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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