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Regulatory Assets and Liabilities (Textual) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 19, 2017 | Dec. 31, 2016
Regulatory Assets [Line Items] |  |  |
Regulatory assets | $ 4,914 |  | $ 7,455
SCE |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets | $ 4,914 |  | $ 7,455
Regulatory assets, energy derivatives, low range of contract expiration (in years) | 3 years |  |
Regulatory assets, energy derivatives, high range of contract expiration (in years) | 6 years |  |
Regulatory assets related to deferred income taxes, recovery period, low range (in years) | 1 year |  |
Regulatory assets related to deferred income taxes, recovery period, high range (in years) | 60 years |  |
Low end of the range of remaining original amortization (in years) | 10 years |  |
High end of the range of remaining original amortization (in years) | 35 years |  |
Unamortized investments, net of accumulated amortization | SCE |  |  |
Regulatory Assets [Line Items] |  |  |
Return rate earned on assets included in rate base (as a percent) | 7.90% |  | 7.90%
Regulatory assets | $ 123 |  | $ 80
Unamortized investments, net of accumulated amortization | SCE | Legacy Meters |  |  |
Regulatory Assets [Line Items] |  |  |
Return rate earned on assets included in rate base (as a percent) | 6.46% |  | 6.46%
San Onofre | SCE |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets | $ 72 | $ 775 | $ 857

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- Definition Regulatory assets, energy derivative contracts, high range of expiration + References No definition available. + Details
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- Definition Regulatory assets, energy derivative contracts, low range of expiration + References No definition available. + Details
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- Definition Regulatory assets, recovery period, high range + References No definition available. + Details
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- Definition Regulatory assets, recovery period, low range + References No definition available. + Details
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- Definition Regulatory Noncurrent Asset, Amortization Period, High End of Range + References No definition available. + Details
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- Definition This element represents the return rate earned on assets included in rate base. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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