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Variable Interest Entities (Summary of Trusts' Income Statement) (Details) - SCE - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SCE Trust I |  |  |
Variable Interest Entity [Line Items] |  |  |
Dividend income | $ 14 | $ 27 | $ 27
Dividend distributions | 14 | 27 | 27
SCE Trust II |  |  |
Variable Interest Entity [Line Items] |  |  |
Dividend income | 20 | 20 | 20
Dividend distributions | 20 | 20 | 20
SCE Trust III |  |  |
Variable Interest Entity [Line Items] |  |  |
Dividend income | 16 | 16 | 16
Dividend distributions | 16 | 16 | 16
SCE Trust IV |  |  |
Variable Interest Entity [Line Items] |  |  |
Dividend income | 17 | 17 | 6
Dividend distributions | 17 | 17 | $ 6
SCE Trust V |  |  |
Variable Interest Entity [Line Items] |  |  |
Dividend income | 16 | 13 |
Dividend distributions | 16 | $ 13 |
Trust VI |  |  |
Variable Interest Entity [Line Items] |  |  |
Dividend income | 12 |  |
Dividend distributions | $ 12 |  |

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