Regulatory Assets and Liabilities (Balancing Accounts) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Regulatory Assets and Liabilities
Percentage of vegetation management	115.00%
Percentage of Wildfire Covered Conductor Program	110.00%
SCE
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	$ 1,193	$ 2,287
SCE | Energy resource recovery account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	619	759
SCE | Portfolio allocation balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	327	(183)
SCE | New system generation balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	1	73
SCE | Public purpose programs and energy efficiency programs
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(1,603)	(1,066)
SCE | Base revenue requirement balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	690	849
SCE | GRC wildfire mitigation balancing accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	88	12
SCE | Residential uncollectibles balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	112
SCE | Greenhouse gas auction revenue and low carbon fuel standard revenue
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(421)	(298)
SCE | FERC balancing accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(133)	55
SCE | Wildfire and drought restoration accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	315	299
SCE | Wildfire expense memorandum account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	970	1,456
SCE | COVID 19-related memorandum accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	72	94
SCE | Customer service re-platform (CSRP)
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	211	128
SCE | Tax accounting memorandum account and pole loading balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	55	171
SCE | Excess Bond and Power Charge Balancing Account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(93)
SCE | Other balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	$ (17)	$ (62)