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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2013
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) | 2013 |  | 2012
Transmission | $ | 9,117 |  |  | $ | 7,059 |
Distribution | 17,874 |  |  | 16,872 |
Generation | 2,856 |  |  | 4,455 |
General plant and other | 4,674 |  |  | 4,358 |
Accumulated depreciation | (7,493 | ) |  | (7,424 | )
| 27,028 |  |  | 25,320 |
Construction work in progress | 3,219 |  |  | 4,271 |
Nuclear fuel, at amortized cost | 132 |  |  | 609 |
Total utility property, plant and equipment | $ | 30,379 |  |  | $ | 30,200 |
As a result of the permanent retirement of San Onofre, SCE reclassified utility plant and nuclear fuel into a regulatory asset. For further details, see Note 9. 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. At December 31, 2013 and 2012, capitalized software costs were $1.6 billion and $1.5 billion and accumulated amortization was $839 million and $651 million, respectively. Amortization expense for capitalized software was $251 million, $217 million and $156 million in 2013, 2012 and 2011, respectively. At December 31, 2013, amortization expense is estimated to be approximately $255 million annually for 2014 through 2018. Jointly Owned Utility Projects SCE owns interests in several generating stations and transmission systems for which each participant provides its own financing. SCE's proportionate share of these projects 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 11. The following is SCE's investment in each project as of December 31, 2013:
(in millions) | Plant in Service | Construction Work in Progress | Accumulated Depreciation | Nuclear Fuel (at amortized cost) | Net Book Value |  | Ownership Interest
Transmission systems: |  |  |  |  |  |  |
Eldorado | $ | 87 |  | $ | 10 |  | $ | 15 |  | $ | — |  | $ | 82 |  |  | 62%
Pacific Intertie | 189 |  | 7 |  | 74 |  | — |  | 122 |  |  | 50%
Generating stations: |  |  |  |  |  |  |
Palo Verde (nuclear) | 1,842 |  | 77 |  | 1,505 |  | 132 |  | 546 |  |  | 16%
Total | $ | 2,118 |  | $ | 94 |  | $ | 1,594 |  | $ | 132 |  | $ | 750 |  |  |
In addition to the projects above, SCE has ownership interests in jointly owned power poles with other companies. Sale of Interests in Four Corners Units 4 and 5 In December 2013, SCE completed the sale of its ownership interest in Units 4 and 5 of the Four Corners Generating Station, a coal-fired electric generating facility in New Mexico, to the operator of the facility, Arizona Public Service Company and received net proceeds of approximately $181 million. Under the sale agreement, SCE remains responsible for its pro-rata share of certain environmental liabilities, including penalties arising from environmental violations arising prior to the sale. The sale of Four Corners resulted in a $166 million benefit to SCE's ratepayers and, therefore, will not affect SCE's earnings.

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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 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: 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=6391110&loc=d3e2921-110230 Reference 3: 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=6360339&loc=d3e1361-107760 Reference 4: 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 + Details
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