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Property, Plant and Equipment, Net | 12 Months Ended
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Dec. 31, 2015
Property, Plant and Equipment, Net [Abstract] |
Property, Plant and Equipment, Net | Property, Plant and Equipment, Net As of December 31, 2015 and 2014, the components of property, plant and equipment are stated at cost less accumulated depreciation as follows (in millions):
| 2015 |  | 2014 |  | Depreciable Lives
Buildings, machinery and equipment | $ | 16,294 |  |  | $ | 16,059 |  |  | 3 – 47 Years
Geothermal properties | 1,319 |  |  | 1,294 |  |  | 13 – 58 Years
Other | 208 |  |  | 203 |  |  | 3 – 47 Years
| 17,821 |  |  | 17,556 |  |  |
Less: Accumulated depreciation | 5,377 |  |  | 4,984 |  |  |
| 12,444 |  |  | 12,572 |  |  |
Land | 120 |  |  | 120 |  |  |
Construction in progress | 448 |  |  | 498 |  |  |
Property, plant and equipment, net | $ | 13,012 |  |  | $ | 13,190 |  |  |
Total depreciation expense, including amortization of leased assets, recorded for the years ended December 31, 2015, 2014 and 2013, was $595 million, $591 million and $584 million, respectively. We have various debt instruments that are collateralized by our property, plant and equipment. See Note 6 for a discussion of such instruments. Buildings, Machinery and Equipment This component primarily includes power plants and related equipment. Included in buildings, machinery and equipment are assets under capital leases. See Note 6 for further information regarding these assets under capital leases. Geothermal Properties This component primarily includes power plants and related equipment associated with our Geysers Assets. Other This component primarily includes software and emission reduction credits that are power plant specific and not available to be sold. Capitalized Interest The total amount of interest capitalized was $15 million, $19 million and $38 million for the years ended December 31, 2015, 2014 and 2013, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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