Fair Value Measurements (Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	$ 32,471	$ 29,639
Fair Value	28,700	26,824
SCE
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	28,398	26,258
Fair Value	$ 24,688	$ 23,469