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Fair Value Measurements (Level 3 Rollforward) (Details) - SCE - Level 3 - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value Disclosures Level 3 [Roll Forward]    
Fair value of net assets at beginning of period $ 78 $ 141
Purchases 8 6
Sales (5) (5)
Settlements (117) (60)
Total realized/unrealized gains (losses) 144 (4)
Fair value of net assets at end of period $ 108 $ 78