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Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation | $ (9,355) | $ (9,000)
Total utility property, plant and equipment | 38,708 | 36,806
SCE |  |
Property, Plant and Equipment [Line Items] |  |
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)
Total utility property, plant and equipment, Gross | 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

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- Definition The carrying amount as of the balance sheet of nuclear fuel held as property plant and equipment. This amount is net of amortization based on the energy produced over the life of the fuel. + 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(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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