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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) - Southern California Edison - Level 3 - Congestion revenue rights - Auction prices $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) $ / MWh | Dec. 31, 2017 USD ($) $ / MWh
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ | $ 52 | $ 102
Fair Value, Liabilities | $ | $ 0 | $ 0
CAISO CRR auction prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, price level ($ per MWh) | $ / MWh | (5.49) | (9.41)
CAISO CRR auction prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, price level ($ per MWh) | $ / MWh | 8.79 | 8.66

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