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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) - Southern California Edison - Level 3 $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) $ / MWh $ / MMBTU MW | Dec. 31, 2014 USD ($) $ / MWh $ / MMBTU MW
Congestion revenue rights | Market simulation model |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ | $ 258 | $ 317
Fair Value, Liabilities | $ | $ 0 | $ 0
Congestion revenue rights | Market simulation model | Load Forecast | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, power units (in megawatts) | MW | 7,630 | 7,630
Congestion revenue rights | Market simulation model | Load Forecast | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, power units (in megawatts) | MW | 25,431 | 25,431
Congestion revenue rights | Market simulation model | Power Prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level ($ per MWh) | 1.65 | 1.65
Congestion revenue rights | Market simulation model | Power Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level ($ per MWh) | 109.95 | 109.95
Congestion revenue rights | Market simulation model | Gas Prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level ($ per MWh) | $ / MMBTU | 3.65 | 3.65
Congestion revenue rights | Market simulation model | Gas Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level ($ per MWh) | $ / MMBTU | 6.53 | 6.53
Tolling | Option model |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ | $ 11 | $ 4
Fair Value, Liabilities | $ | $ 1,359 | $ 1,207
Tolling | Option model | Power Prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level ($ per MWh) | 27.03 | 30.60
Expected volatility rate (as a percent) | 25.00% | 25.00%
Tolling | Option model | Power Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level ($ per MWh) | 47.41 | 61.40
Expected volatility rate (as a percent) | 56.00% | 42.00%
Tolling | Option model | Power Prices | Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, Price Level ($ per MWh) | 35.80 | 44.60
Expected volatility rate (as a percent) | 30.00% | 30.00%
Tolling | Option model | Gas Prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 15.00% | 13.00%
Tolling | Option model | Gas Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 45.00% | 53.00%
Tolling | Option model | Gas Prices | Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 20.00% | 20.00%

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