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Summary of Significant Accounting Policies (Deferred Financing Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Regulatory Assets [Line Items] |  |  |
Regulatory assets | $ 7,120 | $ 6,088 |
Amortization of deferred financing costs charged to interest expense | 32 | 30 | $ 30
Long-term debt |  |  |
Regulatory Assets [Line Items] |  |  |
Unamortized debt issuance expense | 131 | 121 |
SCE |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets | 7,120 | 6,088 |
Amortization of deferred financing costs charged to interest expense | 27 | 26 | $ 26
SCE | Long-term debt |  |  |
Regulatory Assets [Line Items] |  |  |
Unamortized debt issuance expense | 117 | 106 |
SCE | Unamortized loss on reacquired debt |  |  |
Regulatory Assets [Line Items] |  |  |
Regulatory assets | $ 133 | $ 142 |

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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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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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