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Variable Interest Entities (Summary of Trusts' Income Statement) (Details) - Southern California Edison - VIE - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Trust II |  |  |  |
Variable Interest Entity |  |  |  |
Dividend income | $ 5 | $ 5 | $ 15 | $ 15
Dividend distributions | 5 | 5 | 15 | 15
Trust III |  |  |  |
Variable Interest Entity |  |  |  |
Dividend income | 4 | 4 | 12 | 12
Dividend distributions | 4 | 4 | 12 | 12
Trust IV |  |  |  |
Variable Interest Entity |  |  |  |
Dividend income | 4 | 4 | 13 | 13
Dividend distributions | 4 | 4 | 13 | 13
Trust V |  |  |  |
Variable Interest Entity |  |  |  |
Dividend income | 4 | 4 | 12 | 12
Dividend distributions | 4 | 4 | 12 | 12
Trust VI |  |  |  |
Variable Interest Entity |  |  |  |
Dividend income | 6 | 6 | 18 | 18
Dividend distributions | $ 6 | $ 6 | $ 18 | $ 18

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