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Compensation and Benefit Plans (Employee Savings Plan) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Contribution Plans [Line Items] |  |  |
Employer contributions | $ 70 | $ 69 | $ 73
SCE |  |  |
Defined Contribution Plans [Line Items] |  |  |
Employer contributions | $ 69 | $ 68 | $ 72

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- Definition Defined Contribution Plans [Line Items] + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Details
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