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Equity (Equity Contributions) (Details) - USD ($) $ in Millions |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 18, 2020 | Aug. 31, 2020 | Jun. 30, 2020 | May 26, 2020 | Apr. 29, 2020 | Feb. 28, 2020 | Dec. 31, 2020
SCE |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Equity investment | $ 325 | $ 219 | $ 100 | $ 319 | $ 200 | $ 269 | $ 1,432

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