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Summary of Significant Accounting Policies (Deferred Financing Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Regulatory Assets [Line Items] |  |  |
Regulatory assets | $ 4,914 | $ 7,455 |
Edison International |  |  |
Regulatory Assets [Line Items] |  |  |
Amortization of deferred financing costs charged to interest expense | 30 | 31 | $ 33
Other long-term assets | Edison International |  |  |
Regulatory Assets [Line Items] |  |  |
Unamortized debt issuance expense | 15 | 10 |
Long-term debt | Edison International |  |  |
Regulatory Assets [Line Items] |  |  |
Unamortized debt issuance expense | 88 | 81 |
SCE |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets | 4,914 | 7,455 |
Amortization of deferred financing costs charged to interest expense | 27 | 27 | $ 28
SCE | Other long-term assets |  |  |
Regulatory Assets [Line Items] |  |  |
Unamortized debt issuance expense | 7 | 7 |
SCE | Long-term debt |  |  |
Regulatory Assets [Line Items] |  |  |
Unamortized debt issuance expense | 77 | 71 |
SCE | Unamortized loss on reacquired debt |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets | $ 168 | $ 184 |

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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