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Summary of Significant Accounting Policies (Deferred Financing Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Regulatory Assets [Line Items] |  |  |
Regulatory assets | $ 5,380 | $ 4,914 |
Edison International |  |  |
Regulatory Assets [Line Items] |  |  |
Amortization of deferred financing costs charged to interest expense | 30 | 30 | $ 31
Other long-term assets | Edison International |  |  |
Regulatory Assets [Line Items] |  |  |
Unamortized debt issuance expense | 10 | 15 |
Long-term debt | Edison International |  |  |
Regulatory Assets [Line Items] |  |  |
Unamortized debt issuance expense | 102 | 88 |
SCE |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets | 5,380 | 4,914 |
Amortization of deferred financing costs charged to interest expense | 26 | 27 | $ 27
SCE | Other long-term assets |  |  |
Regulatory Assets [Line Items] |  |  |
Unamortized debt issuance expense | 8 | 7 |
SCE | Long-term debt |  |  |
Regulatory Assets [Line Items] |  |  |
Unamortized debt issuance expense | 93 | 77 |
SCE | Unamortized loss on reacquired debt |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets | $ 153 | $ 168 |

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