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Variable Interest Entities (Summary of Trusts' Income Statement) (Details) - VIE - Southern California Edison - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Trust II |  |
Variable Interest Entity |  |
Dividend income | $ 5 | $ 5
Dividend distributions | 5 | 5
Trust III |  |
Variable Interest Entity |  |
Dividend income | 4 | 4
Dividend distributions | 4 | 4
Trust IV |  |
Variable Interest Entity |  |
Dividend income | 4 | 4
Dividend distributions | 4 | 4
Trust V |  |
Variable Interest Entity |  |
Dividend income | 4 | 4
Dividend distributions | 4 | 4
Trust VI |  |
Variable Interest Entity |  |
Dividend income | 6 | 6
Dividend distributions | $ 6 | $ 6

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