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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 | Dec. 31, 2019 USD ($) $ / MWh | Dec. 31, 2018 USD ($) $ / MWh
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Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ | $ 83 | $ 141
Fair Value, Liabilities | $ | $ 5 | $ 0
CAISO CRR auction clearing prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | (3.59) | (7.41)
CAISO CRR auction clearing prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 25.32 | 41.52
CAISO CRR auction clearing prices | Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 1.97 | 1.62

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