Regulatory Assets and Liabilities (Balancing Accounts) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 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)	$ 2,004	$ 2,287
SCE | Energy resource recovery account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	102	759
SCE | Portfolio allocation balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	459	(183)
SCE | New system generation balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	16	73
SCE | Public purpose programs and energy efficiency programs
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(1,287)	(1,066)
SCE | Base revenue requirement balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	1,360	849
SCE | GRC wildfire mitigation balancing accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	63	12
SCE | Residential uncollectibles balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	38
SCE | Greenhouse gas auction revenue and low carbon fuel standard revenue
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(393)	(298)
SCE | FERC balancing accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	26	55
SCE | Wildfire and drought restoration accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	305	299
SCE | Wildfire expense memorandum account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	1,034	1,456
SCE | COVID 19-related memorandum accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	97	94
SCE | Customer service re-platform memorandum account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	159	128
SCE | Tax accounting memorandum account and pole loading balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	144	171
SCE | Excess Bond and Power Charge Balancing Account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(144)
SCE | Other balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	$ 25	$ (62)