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Property, Plant and Equipment (Textual) (Details) - Southern California Edison - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Property, Plant and Equipment [Line Items] |  |  |
Capitalized software costs | $ 1,400 | $ 1,700 |
Capitalized software, accumulated amortization | 900 | 1,000 |
Capitalized software, amortization expense | 268 | $ 271 | $ 251
Capitalized software, estimated annual amortization expense for 2015 through 2019 | $ 237 |  |
Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Lives | 5 years |  |
Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Lives | 15 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=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + 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 + Details
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