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Summary of Significant Accounting Policies (Goodwill) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2017
SoCore Energy |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment |  |  | $ 17
Goodwill impairment after-tax |  |  | $ 10
Edison Energy Group |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment | $ 25 | $ 19 |
Goodwill impairment after-tax | 18 | 13 |
Goodwill | 34 | $ 59 |
Edison Energy |  |  |
Goodwill [Line Items] |  |  |
Investment | $ 57 |  |

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