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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment SCE's property, plant and equipment included in the consolidated balance sheets is composed of the following:
| December 31,
(in millions) | 2017 |  | 2016
Distribution | $ | 23,633 |  |  | $ | 22,332 |
Transmission | 13,127 |  |  | 12,549 |
Generation | 3,468 |  |  | 3,376 |
General plant and other | 4,534 |  |  | 4,633 |
Accumulated depreciation | (9,355 | ) |  | (9,000 | )
| 35,407 |  |  | 33,890 |
Construction work in progress | 3,175 |  |  | 2,790 |
Nuclear fuel, at amortized cost | 126 |  |  | 126 |
Total utility property, plant and equipment | $ | 38,708 |  |  | $ | 36,806 |
Capitalized Software Costs SCE capitalizes costs incurred during the application development stage of internal use software projects to property, plant, and equipment. SCE amortizes capitalized software costs ratably over the expected lives of the software, primarily ranging from 5 to 10 years and commencing upon operational use. Capitalized software costs, included in general plant and other above, were $1.1 billion and $1.4 billion at December 31, 2017 and 2016, respectively, and accumulated amortization was $0.6 billion and $0.8 billion, at December 31, 2017 and 2016, respectively. Amortization expense for capitalized software was $233 million, $249 million and $268 million in 2017, 2016 and 2015, respectively. At December 31, 2017, amortization expense is estimated to be $176 million, $127 million, $92 million, $62 million and $26 million for 2018 through 2022, respectively. Jointly Owned Utility Projects SCE owns undivided interests in several generating assets for which each participant provides its own financing. SCE's proportionate share of these assets is reflected in the consolidated balance sheets and included in the above table. SCE's proportionate share of expenses for each project is reflected in the consolidated statements of income. A portion of the investments in Palo Verde generating stations is included in regulatory assets on the consolidated balance sheets. For further information, see Note 10. The following is SCE's investment in each asset as of December 31, 2017:
(in millions) | Plant in Service | Construction Work in Progress | Accumulated Depreciation | Nuclear Fuel (at amortized cost) | Net Book Value | Ownership Interest
Transmission systems: |  |  |  |  |  |
Eldorado | $ | 237 |  | $ | 14 |  | $ | 24 |  | $ | — |  | $ | 227 |  | 59 | %
Pacific Intertie | 192 |  | 41 |  | 78 |  | — |  | 155 |  | 50 | %
Generating station: |  |  |  |  |  |
Palo Verde (nuclear) | 2,001 |  | 52 |  | 1,557 |  | 126 |  | 622 |  | 16 | %
Total | $ | 2,430 |  | $ | 107 |  | $ | 1,659 |  | $ | 126 |  | $ | 1,004 |  |
In addition, SCE has ownership interests in jointly owned power poles with other companies.

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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 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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