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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
--- | --- | ---
Jun. 30, 2016 USD ($) $ / MWh $ / MMBTU MW | Dec. 31, 2015 USD ($) $ / MWh $ / MMBTU MW
Congestion revenue rights | Market simulation model and auction prices |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ | $ 119 | $ 152
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 | 6,289 | 6,289
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 | 24,349 | 24,349
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) | 0.00 | 0.00
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) | 110.44 | 110.44
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 | 1.98 | 1.98
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 | 5.72 | 5.72
Tolling | Option model |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ | $ 3 | $ 10
Fair Value, Liabilities | $ | $ 1,293 | $ 1,297
Tolling | Option model | Power Prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, price level ($ per MWh) | 25.77 | 24.15
Expected volatility rate (as a percent) | 26.00% | 26.00%
Tolling | Option model | Power Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, price level ($ per MWh) | 50.38 | 46.93
Expected volatility rate (as a percent) | 86.00% | 38.00%
Tolling | Option model | Power Prices | Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, price level ($ per MWh) | 37.50 | 34.80
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% | 15.00%
Tolling | Option model | Gas Prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Expected volatility rate (as a percent) | 41.00% | 58.00%
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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