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Fair Value Measurements (Level 3 Fair Value Measurements) (Details) - SCE - Level 3 - Congestion revenue rights (GWh) - Auction prices $ in Millions | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ 103 | $ 120
Fair Value, Liabilities | $ 12 | $ 12
CAISO CRR auction clearing prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | (3.84) | (9.67)
CAISO CRR auction clearing prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 300.47 | 300.47
CAISO CRR auction clearing prices | Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 2.68 | 2.75

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