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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) - Southern California Edison - Level 3 $ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2017 USD ($) $ / MWh $ / MMBTU MW | Dec. 31, 2016 USD ($) $ / MWh $ / MMBTU MW
Congestion revenue rights | Market simulation model and auction prices |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ | $ 36 | $ 67
Fair Value, Liabilities | $ | $ 0 | $ 0
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 | 3,708 | 3,708
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 | 22,840 | 22,840
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) | 3.65 | 3.65
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) | 99.58 | 99.58
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) | $ / MMBTU | 2.51 | 2.51
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) | $ / MMBTU | 4.87 | 4.87
Tolling | Option model |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ | $ 0 | $ 0
Fair Value, Liabilities | $ | $ 1,043 | $ 1,154
Tolling | Option model | Power prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, price level ($ per MWh) | 23.41 | 23.40
Expected volatility rate | 27.00% | 29.00%
Tolling | Option model | Power prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, price level ($ per MWh) | 47.10 | 51.24
Expected volatility rate | 67.00% | 71.00%
Tolling | Option model | Power prices | Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, price level ($ per MWh) | 33.16 | 34.70
Expected volatility rate | 34.00% | 40.00%
Tolling | Option model | Gas prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate | 13.00% | 15.00%
Tolling | Option model | Gas prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate | 43.00% | 48.00%
Tolling | Option model | Gas prices | Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate | 21.00% | 20.00%

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