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Fair Value Measurements (Level 3 Rollforward) (Details) - SCE - Level 3 - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value Disclosures Level 3 [Roll Forward]        
Fair value of net assets at beginning of period $ 91 $ 52 $ 108 $ 78
Purchases       8
Sales (1) (3) (1) (4)
Settlements (2) (6) (16) (26)
Total realized/unrealized losses (21) (9) (24) (22)
Fair value of net assets at end of period $ 67 $ 34 $ 67 $ 34