Regulatory Assets and Liabilities (Balancing Accounts) (Details) - SCE - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	$ 1,660	$ 2,289
Energy procurement related costs
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	397	1,104
Public purpose and energy efficiency
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(1,736)	(1,577)
GRC related balancing accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	1,361	1,034
Wildfire risk mitigation and insurance
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	1,169	1,168
Wildfire and drought restoration
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	417	352
COVID-19 costs
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	16	67
Other
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	$ 36	$ 141