Variable Interest Entities (Trusts) (Details) - SCE - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Variable Interest Entities
Common stock	$ 2,168,000,000		$ 2,168,000,000
Trust securities
Variable Interest Entities
Liquidation value (in dollars per share)				$ 2,500
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities
Liquidation value (in dollars per share)				$ 25
Common stock	10,000		10,000	$ 10,000
Power Purchase Agreement
Variable Interest Entities
Amounts paid to VIEs	157,000,000	$ 170,000,000
Trust II
Variable Interest Entities
Liquidation preference								$ 400,000,000
Trust II | Trust securities
Variable Interest Entities
Investments	220,000,000		220,000,000
Trust II | 5.10% Series G Preferred Stock
Variable Interest Entities
Security dividend rate (as a percent)								5.10%
Liquidation preference								$ 400,000,000
Investments	220,000,000		220,000,000
Trust III
Variable Interest Entities
Liquidation preference							$ 275,000,000
Trust III | Trust securities
Variable Interest Entities
Investments	275,000,000		275,000,000
Trust III | 5.75% Series H Preferred Stock
Variable Interest Entities
Security dividend rate (as a percent)							5.75%
Liquidation preference							$ 275,000,000
Investments	275,000,000		275,000,000
Trust IV
Variable Interest Entities
Liquidation preference						$ 325,000,000
Trust IV | Trust securities
Variable Interest Entities
Investments	325,000,000		325,000,000
Trust IV | 5.375% Series J Preferred Stock
Variable Interest Entities
Security dividend rate (as a percent)						5.375%
Liquidation preference						$ 325,000,000
Investments	325,000,000		325,000,000
Trust V
Variable Interest Entities
Liquidation preference					$ 300,000,000
Trust V | Trust securities
Variable Interest Entities
Investments	300,000,000		300,000,000
Trust V | 5.45% Series K Preferred Stock
Variable Interest Entities
Security dividend rate (as a percent)					5.45%
Liquidation preference					$ 300,000,000
Investments	300,000,000		300,000,000
Trust VI
Variable Interest Entities
Liquidation preference				$ 475,000,000
Trust VI | Trust securities
Variable Interest Entities
Investments	475,000,000		475,000,000
Trust VI | 5.00% Series L Preferred Stock
Variable Interest Entities
Security dividend rate (as a percent)				5.00%
Liquidation preference				$ 475,000,000
Investments	475,000,000		475,000,000
Trust VII
Variable Interest Entities
Liquidation preference			550,000,000
Trust VII | Trust securities
Variable Interest Entities
Investments	550,000,000		$ 550,000,000
Trust VII | 7.50% Series M Preferred Stock
Variable Interest Entities
Security dividend rate (as a percent)			7.50%
Liquidation preference			$ 550,000,000
Investments	$ 550,000,000