Regulatory Assets and Liabilities (Balancing Accounts) (Details) - SCE - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	$ 1,487	$ 2,289
Energy resource recovery account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(141)	1,580
Portfolio allocation balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	929	(73)
New system generation balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	237	(63)
Public purpose programs and energy efficiency programs
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(1,805)	(1,577)
Base revenue requirement balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	1,006	1,108
GRC wildfire mitigation balancing accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	174	67
Residential uncollectibles balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	51
Greenhouse gas auction revenue and low carbon fuel standard revenue
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(393)	(289)
FERC balancing accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(208)	(123)
Wildfire and drought restoration accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	432	352
Wildfire-related memorandum accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	985	1,168
Risk management balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(74)
COVID 19-related memorandum accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	66	67
Customer service re-platform (CSRP)
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	96	64
Tax accounting memorandum account and pole loading balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	61	90
Excess Bond and Power Charge Balancing Account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	11	(56)
Other balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	$ 60	$ (26)