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Fair Value Measurements (Level 3 Rollforward) (Details) - Southern California Edison - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Sep. 30, 2017 | Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Liabilities Transfered Out Of Derivatives |  | $ 914 |
Level 3 |  |  |
Fair Value Disclosures Level 3 [Roll Forward] |  |  |
Fair value of net assets (liabilities) at beginning of period | $ 101 |  | $ (1,089)
Total realized/unrealized gains (losses): |  |  |
Included in regulatory assets and liabilities | (20) |  | (77)
Fair value of net assets (liabilities) at end of period2 | 81 |  | (1,166)
Change during the period in unrealized losses related to assets and liabilities held at the end of the period | $ 5 |  | $ (102)

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- Definition This element represents total gains or losses for the period (realized and unrealized), included in regulatory assets and liabilities measured at fair value on a recurring basis using unobservable inputs (level 3). + References No definition available. + Details
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- Definition This element represents the change during the period in unrealized gains (losses) for financial instruments, held at the end of the period, with unobservable inputs (level 3). + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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