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Fair Value Measurements (Level 3 Rollforward) (Details) - SCE - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Total realized/unrealized gains: |  |  |
Reclassified derivative liabilities | $ 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: |  |  |
Included in regulatory assets and liabilities |  | 40 | 133
Contract amendment |  | 0 | 143
Normal purchase and normal sale designation |  | 0 | 914
Fair value of net assets at end of period |  | 141 | 101
Change during the period in unrealized gains and losses related to assets and liabilities held at the end of the period |  | $ 138 | $ 100

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- Definition Derivative Liabilities Transfered Out Of Derivatives + References No definition available. + Details
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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 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss), Contract Amendment + 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 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 Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 + Details
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