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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
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Trust I |  |
Variable Interest Entity |  |
Dividend income | $ 7 | $ 7
Dividend distributions | 7 | 7
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 | 1
Dividend distributions | $ 4 | $ 1

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