Regulatory Assets and Liabilities (Balancing Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
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)	$ 2,287	$ 1,388
SCE | Energy resource recovery account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	759	(89)
SCE | Portfolio allocation balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(183)	497
SCE | New system generation balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	73	(10)
SCE | Public purpose programs and energy efficiency programs
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(1,066)	(1,130)
SCE | Base revenue requirement balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	849	622
SCE | GRC wildfire mitigation balancing accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	12
SCE | Greenhouse gas auction revenue and low carbon fuel standard revenue
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(298)	(125)
SCE | FERC balancing accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	55	12
SCE | Wildfire and drought restoration accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	299	361
SCE | Wildfire expense memorandum account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	1,456	1,104
SCE | COVID 19-related memorandum accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	94	176
SCE | Customer service re-platform memorandum account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	128	30
SCE | Tax accounting memorandum account and pole loading balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	171	(35)
SCE | Other balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	$ (62)	$ (25)