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Summary of Significant Accounting Policies (Deferred Financing) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Regulatory Assets [Line Items] |  |  |
Regulatory assets | $ 7,660 | $ 7,120 |
Unamortized debt issuance expense | 153 | 131 |
Amortization of deferred financing costs charged to interest expense | 34 | 32 | $ 30
SCE |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets | 7,660 | 7,120 |
Unamortized debt issuance expense | 143 | 117 |
Amortization of deferred financing costs charged to interest expense | 29 | 27 | $ 26
SCE | Unamortized loss on reacquired debt |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets | $ 121 | $ 133 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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