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Regulatory Assets and Liabilities (Textual) (Details) - USD ($) $ in Millions | 12 Months Ended | 13 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Feb. 28, 2019 | Dec. 31, 2017 | Dec. 19, 2017
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets | $ 5,380 | $ 5,380 |  | $ 4,914 |
SCE |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets | $ 5,380 | 5,380 |  | $ 4,914 |
Regulatory assets, energy derivatives, low range of contract expiration (in years) | 2 years |  |  |  |
Regulatory assets, energy derivatives, high range of contract expiration (in years) | 5 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 |  |  |  |
Wildfire insurance coverage | $ 1,000 | $ 300 |  |  |
Unamortized investments, net of accumulated amortization | SCE |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Return rate earned on assets included in rate base (as a percent) | 7.61% | 7.61% |  | 7.90% |
Regulatory assets | $ 118 | $ 118 |  | $ 123 |
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% |
San Onofre | SCE |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Regulatory assets | 0 | 0 |  | $ 72 | $ 775
Revenue subject to refund | Catastrophic event memorandum account | SCE |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Net Regulatory Assets | 144 | 144 |  | 102 |
Revenue subject to refund | Wildfire expense memorandum account | SCE |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Net Regulatory Assets | 128 | 128 |  | 0 |
Revenue subject to refund | FERC Balancing Account | SCE |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Net Regulatory Assets | $ (180) | $ (180) |  | $ (205) |
Subsequent event | SCE |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Net Regulatory Assets |  |  | $ 107 |  |
Subsequent event | Revenue subject to refund | Wildfire liability insurance recovery | SCE |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Net Regulatory Assets |  |  | $ 107 |  |

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- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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