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Property, Plant and Equipment (Textual) (Details) - SCE - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |
Capitalized software costs | $ 1,100 | $ 1,400 |
Capitalized software, accumulated amortization | 600 | 800 |
Capitalized software, amortization expense | 233 | $ 249 | $ 268
Capitalized software, estimated amortization year 1 | 176 |  |
Capitalized software, estimated amortization year 2 | 127 |  |
Capitalized software, estimated amortization year 3 | 92 |  |
Capitalized software, estimated amortization year 4 | 62 |  |
Capitalized software, estimated amortization year 5 | $ 26 |  |
Capitalized software costs | Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 5 years |  |
Capitalized software costs | Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 10 years |  |

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- Definition For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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