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Variable Interest Entities (Summary of Trusts' Income Statement) (Details) - Variable Interest Entity, Not Primary Beneficiary - Southern California Edison - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Trust I |  |  |  |
Variable Interest Entity |  |  |  |
Dividend income |  | $ 6 |  | $ 13
Dividend distributions |  | 6 |  | 13
Trust II |  |  |  |
Variable Interest Entity |  |  |  |
Dividend income | $ 5 | 5 | $ 10 | 10
Dividend distributions | 5 | 5 | 10 | 10
Trust III |  |  |  |
Variable Interest Entity |  |  |  |
Dividend income | 4 | 4 | 8 | 8
Dividend distributions | 4 | 4 | 8 | 8
Trust IV |  |  |  |
Variable Interest Entity |  |  |  |
Dividend income | 5 | 5 | 9 | 9
Dividend distributions | 5 | 5 | 9 | 9
Trust V |  |  |  |
Variable Interest Entity |  |  |  |
Dividend income | 4 | 4 | 8 | 8
Dividend distributions | 4 | 4 | 8 | 8
Trust VI |  |  |  |
Variable Interest Entity |  |  |  |
Dividend income | 6 | 0 | 12 | 0
Dividend distributions | $ 6 | $ 0 | $ 12 | $ 0

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