Regulatory Assets and Liabilities (Balancing Accounts) (Details) - SCE - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	$ 81	$ 1,660
Energy procurement related costs
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(376)	397
Public purpose and energy efficiency
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	(1,864)	(1,736)
GRC related balancing accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	852	1,361
FERC balancing accounts
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	42	(211)
Wildfire risk mitigation and insurance
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	687	1,169
Wildfire and drought restoration
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	256	417
Residential uncollectibles balancing account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	179
Customer service re-platform memorandum account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	116	21
Tax accounting memorandum account
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	13	108
Other
Regulatory Assets and Liabilities
Net regulatory assets (liabilities)	$ 176	$ 134