Fair Value Measurements (Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	$ 34,851	$ 33,013
Fair Value	33,887	31,315
SCE
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	29,830	28,494
Fair Value	$ 28,679	$ 26,712