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Related-Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Related party transactions |  |  |  |
Long-term insurance receivable due from affiliate | $ 501 |  | $ 465 |
SCE |  |  |  |
Related party transactions |  |  |  |
Wildfire insurance expense |  | $ 450 |  |
SCE | Wildfire liability insurance | Edison Insurance Services-EIS |  |  |  |
Related party transactions |  |  |  |
Wildfire-related insurance premiums | 0 |  | 273 | $ 185
Insurance purchased but not reinsured |  | $ 93 |  |
Insurance income and related expense | 44 |  |  |
Prepaid insurance |  |  | 106 |
Long-term insurance receivable due from affiliate | 355 |  | 334 |
Wildfire insurance expense | $ 132 |  | $ 213 | $ 192

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- Definition Carrying amount due after one year of the balance sheet date (or one operating cycle, if longer) of amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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