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Summary of Significant Accounting Policies (New Accounting Guidance) (Details) - USD ($) $ in Millions | Jan. 01, 2019 | Mar. 31, 2019 | Jan. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
ROU assets |  | $ 933 |  | $ 0
Southern California Edison |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
ROU assets |  | 928 |  | $ 0
ROU lease liability |  | $ 928 |  |
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] |  |  |  |
Reclassification of stranded tax effects | 10 |  |  |
ASU 2018-02 | Southern California Edison |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Reclassification of stranded tax effects | $ 5 |  |  |

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