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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) - SCE - Level 3 - Congestion revenue rights - Auction prices $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / MWh | Dec. 31, 2017 USD ($) $ / MWh
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ | $ 141 | $ 102
Fair Value, Liabilities | $ | $ 0 | $ 0
CAISO CRR auction clearing prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, price level ($ per MWh) | $ / MWh | (7.41) | (9.41)
CAISO CRR auction clearing prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value Inputs, price level ($ per MWh) | $ / MWh | 41.52 | 8.66

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