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Fair Value Measurements (Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Fair Value of Long-Term Debt Recorded at Carrying Value    
Carrying Value $ 27,318 $ 25,247
Fair Value 24,917 27,718
SCE    
Fair Value of Long-Term Debt Recorded at Carrying Value    
Carrying Value 24,178 22,110
Fair Value $ 21,810 $ 24,375