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Fair Value Measurements (Level 3 Inputs) (Details) - SCE - Level 3 - Congestion revenue rights (GWh) - Auction prices $ in Millions | Jun. 30, 2022 USD ($) $ / MWh | Dec. 31, 2021 USD ($)
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Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ 37 | $ 49
Fair Value, Liabilities | $ 5 | $ 5
Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | (18.87) | (18.87)
Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 306.31 | 43.03
Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 1.48 | 1.46

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