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Fair Value Measurements (Level 3) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value Disclosures Level 3 [Roll Forward]    
Transfers into or out of Level 3 $ 0 $ 0
SCE | Level 3    
Fair Value Disclosures Level 3 [Roll Forward]    
Fair value of net assets at beginning of period 108 78
Purchases   8
Sales (2) (5)
Settlements (63) (117)
Total realized/unrealized losses 1 144
Fair value of net assets at end of period $ 44 $ 108