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Related-Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |
Wildfire Insurance Fund expense | $ 336 | $ 152 | $ 0
SCE |  |  |
Related Party Transaction [Line Items] |  |  |
Current insurance receivable due from affiliate | 268 | 0 |
Wildfire Insurance Fund expense | 336 | 152 | 0
SCE | Wildfire liability insurance | Wholly-owned subsidiary |  |  |
Related Party Transaction [Line Items] |  |  |
Wildfire insurance premiums | 176 | 260 | 22
Current insurance receivable due from affiliate | 268 | 0 |
Long-term insurance receivables due from affiliate | 0 | 803 |
Prepaid Insurance | 56 | 10 |
Wildfire Insurance Fund expense | $ 189 | $ 173 | $ 140

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