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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Trust I |  |  |  |
Variable Interest Entity |  |  |  |
Dividend income | $ 7 | $ 7 | $ 20 | $ 20
Dividend distributions | 7 | 7 | 20 | 20
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 | 2 | 13 | 2
Dividend distributions | 4 | $ 2 | 13 | $ 2
Trust V |  |  |  |
Variable Interest Entity |  |  |  |
Dividend income | 4 |  | 9 |
Dividend distributions | $ 4 |  | $ 9 |

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