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Fair Value Measurements (Level 3) (Details) - SCE - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fair Value Disclosures Level 3 [Roll Forward]        
Transfers into or out of Level 3     $ 0 $ 0
Level 3        
Fair Value Disclosures Level 3 [Roll Forward]        
Fair value of net assets at beginning of period $ 67 $ 34 108 78
Purchases   1   8
Sales (1) (1) (2) (5)
Settlements (30) (69) (46) (95)
Total realized/unrealized losses 69 63 45 42
Fair value of net assets at end of period $ 105 $ 28 $ 105 $ 28