Fair Value Measurements (Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	$ 34,673	$ 33,013
Fair Value	32,472	31,315
SCE
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	30,152	28,494
Fair Value	$ 27,881	$ 26,712