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Related-Party Transactions (Details) - SCE - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]              
Current insurance receivable due from affiliates $ 0       $ 0   $ 268
Wildfire insurance expense         425    
Wildfire liability insurance | Wholly-owned subsidiary              
Related Party Transaction [Line Items]              
Wildfire-related insurance premiums   $ 160   $ 176      
Current insurance receivable due from affiliates 0       0   268
Prepaid Insurance 79       79   $ 56
Wildfire insurance expense $ 41   $ 45   $ 128 $ 145