v3.19.1

Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2019
Accounting Policies [Abstract] |
Schedule of components of restricted cash | The table below represents the components of our restricted cash as of March 31, 2019 and December 31, 2018 (in millions):
| March 31, 2019 |  | December 31, 2018
| Current |  | Non-Current |  | Total |  | Current |  | Non-Current |  | Total
Debt service | $ | 17 |  |  | $ | 7 |  |  | $ | 24 |  |  | $ | 13 |  |  | $ | 8 |  |  | $ | 21 |
Construction/major maintenance | 24 |  |  | 29 |  |  | 53 |  |  | 23 |  |  | 24 |  |  | 47 |
Security/project/insurance | 203 |  |  | 31 |  |  | 234 |  |  | 120 |  |  | — |  |  | 120 |
Other | 21 |  |  | 2 |  |  | 23 |  |  | 11 |  |  | 2 |  |  | 13 |
Total | $ | 265 |  |  | $ | 69 |  |  | $ | 334 |  |  | $ | 167 |  |  | $ | 34 |  |  | $ | 201 |
Schedule of property, plant and equipment | Property, Plant and Equipment, Net — At March 31, 2019 and December 31, 2018, the components of property, plant and equipment are stated at cost less accumulated depreciation as follows (in millions):
| March 31, 2019 |  | December 31, 2018 |  | Depreciable Lives
Buildings, machinery and equipment | $ | 16,538 |  |  | $ | 16,400 |  |  | 1.5 | – | 50 | Years
Geothermal properties | 1,503 |  |  | 1,501 |  |  | 13 | – | 58 | Years
Other | 264 |  |  | 286 |  |  | 3 | – | 50 | Years
| 18,305 |  |  | 18,187 |  |  |  |  |  |
Less: Accumulated depreciation | 6,764 |  |  | 6,832 |  |  |  |  |  |
| 11,541 |  |  | 11,355 |  |  |  |  |  |
Land | 121 |  |  | 121 |  |  |  |  |  |
Construction in progress | 386 |  |  | 966 |  |  |  |  |  |
Property, plant and equipment, net | $ | 12,048 |  |  | $ | 12,442 |  |  |  |  |  |

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