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Fair Value Measurements (Level 3 Inputs) (Details) - SCE - Level 3 - Congestion revenue rights (GWh) - Auction prices $ in Millions | Dec. 31, 2021 USD ($) $ / MWh | Dec. 31, 2020 USD ($) $ / MWh
--- | --- | ---
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ | $ 49 | $ 120
Fair Value, Liabilities | $ | $ 5 | $ 12
Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | (18.87) | (9.67)
Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 43.03 | 300.47
Weighted Average |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Derivative Asset (Liability) Net, Measurement Input | 1.46 | 2.75

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