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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2016
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) | 2016 |  | 2015
Distribution | $ | 22,332 |  |  | $ | 20,871 |
Transmission | 12,549 |  |  | 11,592 |
Generation | 3,376 |  |  | 3,138 |
General plant and other | 4,633 |  |  | 4,543 |
Accumulated depreciation | (9,000 | ) |  | (8,548 | )
| 33,890 |  |  | 31,596 |
Construction work in progress | 2,790 |  |  | 3,218 |
Nuclear fuel, at amortized cost | 126 |  |  | 131 |
Total utility property, plant and equipment | $ | 36,806 |  |  | $ | 34,945 |
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, ranging from 5 to 15 years and commencing upon operational use. Capitalized software costs, included in general plant and other above, were $1.4 billion at both December 31, 2016 and 2015 and accumulated amortization was $0.8 billion and $0.9 billion, at December 31, 2016 and 2015, respectively. Amortization expense for capitalized software was $249 million, $268 million and $271 million in 2016, 2015 and 2014, respectively. At December 31, 2016, amortization expense is estimated to be approximately $243 million annually for 2017 through 2021. 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, 2016:
(in millions) | Plant in Service | Construction Work in Progress | Accumulated Depreciation | Nuclear Fuel (at amortized cost) | Net Book Value | Ownership Interest
Transmission systems: |  |  |  |  |  |
Eldorado | $ | 235 |  | $ | 10 |  | $ | 21 |  | $ | — |  | $ | 224 |  | 59%
Pacific Intertie | 192 |  | 21 |  | 80 |  | — |  | 133 |  | 50%
Generating station: |  |  |  |  |  |
Palo Verde (nuclear) | 1,959 |  | 62 |  | 1,547 |  | 126 |  | 600 |  | 16%
Total | $ | 2,386 |  | $ | 93 |  | $ | 1,648 |  | $ | 126 |  | $ | 957 |  |
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 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=64827811&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=64862545&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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