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Summary of Significant Accounting Policies (New Accounting Guidance) (Details) - USD ($) $ in Millions | Jan. 01, 2019 | Sep. 30, 2019 | Jan. 31, 2019
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
ROU assets |  | $ 705 |
Southern California Edison |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
ROU assets |  | 701 |
ROU lease liability |  | $ 701 |
ASU 2016-02 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
ROU assets | $ 956 |  |
ROU lease liability |  |  | $ 956
ASU 2016-02 | Southern California Edison |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
ROU assets | 951 |  |
ROU lease liability |  |  | $ 951
ASU 2018-02 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Reclassified stranded tax effects | 10 |  |
ASU 2018-02 | Southern California Edison |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Reclassified stranded tax effects | $ 5 |  |

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- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL116659650-108580 + Details
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