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Fair Value Measurements (Level 3) (Details) - SCE - Level 3 - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Fair Value Disclosures Level 3 [Roll Forward]        
Fair value of net assets at beginning of period $ 32 $ 67 $ 44 $ 108
Sales (1) (1) (7) (2)
Settlements (25) (30) (54) (46)
Total realized/unrealized gains 47 69 70 45
Fair value of net assets at end of period $ 53 $ 105 $ 53 $ 105