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Fair Value Measurements (Level 3 Rollforward) (Details) - SCE - Level 3 - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value Disclosures Level 3 [Roll Forward]    
Fair value of net assets at beginning of period $ 108 $ 78
Purchases   7
Sales   (1)
Settlements (14) (20)
Total realized/unrealized losses (3) (12)
Fair value of net assets at end of period $ 91 $ 52