Fair Value Measurements (Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	$ 33,013	$ 29,639
Fair Value	31,315	26,824
SCE
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	28,494	26,258
Fair Value	$ 26,712	$ 23,469