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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) - SCE $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) $ / MWh MW | Dec. 31, 2016 USD ($) $ / MWh MW
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Reclassified derivative liabilities | $ | $ 914 |  |
Level 3 |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Reclassified derivative liabilities | $ | $ 914 |  |
Level 3 | Congestion revenue rights | Market simulation model and auction prices |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Fair Value, Assets | $ |  | $ 102 | $ 67
Fair Value, Liabilities | $ |  | $ 0 | $ 0
Level 3 | Congestion revenue rights | Market simulation model and auction prices | Load forecast | Minimum |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Fair value inputs, power units (in megawatts) | MW |  | 5,002 | 3,708
Level 3 | Congestion revenue rights | Market simulation model and auction prices | Load forecast | Maximum |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Fair value inputs, power units (in megawatts) | MW |  | 22,970 | 22,840
Level 3 | Congestion revenue rights | Market simulation model and auction prices | Power prices | Minimum |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Fair Value Inputs, price level ($ per MWh) |  | (15.00) | 3.65
Level 3 | Congestion revenue rights | Market simulation model and auction prices | Power prices | Maximum |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Fair Value Inputs, price level ($ per MWh) |  | 120.00 | 99.58
Level 3 | Congestion revenue rights | Market simulation model and auction prices | Gas prices | Minimum |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Fair Value Inputs, price level ($ per MWh) |  | 2.46 | 2.51
Level 3 | Congestion revenue rights | Market simulation model and auction prices | Gas prices | Maximum |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Fair Value Inputs, price level ($ per MWh) |  | 4.37 | 4.87
Level 3 | Congestion revenue rights | Market simulation model and auction prices | CAISO CRR auction clearing prices | Minimum |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Fair Value Inputs, price level ($ per MWh) |  | (9.41) |
Level 3 | Congestion revenue rights | Market simulation model and auction prices | CAISO CRR auction clearing prices | Maximum |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Fair Value Inputs, price level ($ per MWh) |  | 8.66 |
Level 3 | Tolling3 | Option model |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Fair Value, Assets | $ |  |  | $ 0
Fair Value, Liabilities | $ |  |  | $ 1,154
Level 3 | Tolling3 | Option model | Power prices | Minimum |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Fair Value Inputs, price level ($ per MWh) |  |  | 23.40
Expected volatility rate (as a percent) |  |  | 29.00%
Level 3 | Tolling3 | Option model | Power prices | Maximum |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Fair Value Inputs, price level ($ per MWh) |  |  | 51.24
Expected volatility rate (as a percent) |  |  | 71.00%
Level 3 | Tolling3 | Option model | Gas prices | Minimum |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Expected volatility rate (as a percent) |  |  | 15.00%
Level 3 | Tolling3 | Option model | Gas prices | Maximum |  |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |  |
Expected volatility rate (as a percent) |  |  | 48.00%

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