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Related-Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]      
Wildfire insurance expense     $ 450
SCE      
Related Party Transaction [Line Items]      
Current insurance receivable due from affiliates $ 268   268
SCE | Wildfire liability insurance | Wholly-owned subsidiary      
Related Party Transaction [Line Items]      
Wildfire-related insurance premiums 0 $ 0  
Current insurance receivable due from affiliates 268   268
Prepaid Insurance 28   $ 56
Wildfire insurance expense $ 43 $ 50