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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) - Southern California Edison - Level 3 - Congestion revenue rights - Auction prices $ in Millions | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair Value, Assets | $ 30 | $ 83
Fair Value, Liabilities | $ 2 | $ 5
CAISO CRR auction prices | Minimum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, price level ($ per MWh) | (7.72) | 3.59
CAISO CRR auction prices | Maximum |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, price level ($ per MWh) | 9.91 | 25.32
CAISO CRR auction prices | Weighted Average [Member] |  |
Quantitative Information About Level 3 Measurements [Line Items] |  |
Fair value inputs, price level ($ per MWh) | 1.72 | 1.97

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