Regulatory Assets and Liabilities (Balancing Accounts) (Details) - SCE - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	$ 1,396	$ 1,660
Energy procurement related costs
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(79)	397
Public purpose and energy efficiency
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(1,815)	(1,736)
GRC related balancing accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	1,738	1,361
Wildfire risk mitigation and insurance
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	834	1,169
Wildfire and drought restoration
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	423	417
Other
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	$ 295	$ 52