Regulatory Assets and Liabilities (Balancing Accounts) (Details) - SCE - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Regulatory Assets and Liabilities
Assets, net of liabilities	$ 1,883	$ 423
Energy procurement related costs
Regulatory Assets and Liabilities
Assets, net of liabilities	(106)	(97)
Public purpose and energy efficiency
Regulatory Assets and Liabilities
Assets, net of liabilities	(1,930)	(1,708)
GRC related balancing accounts
Regulatory Assets and Liabilities
Assets, net of liabilities	992	976
FERC related balancing accounts
Regulatory Assets and Liabilities
Assets, net of liabilities	131	125
Wildfire risk mitigation and insurance
Regulatory Assets and Liabilities
Assets, net of liabilities	731	741
TKM Settlement cost recovery
Regulatory Assets and Liabilities
Assets, net of liabilities	1,556	0
Wildfire and drought restoration
Regulatory Assets and Liabilities
Assets, net of liabilities	284	238
Tax accounting memorandum account
Regulatory Assets and Liabilities
Assets, net of liabilities	(88)	(40)
Other
Regulatory Assets and Liabilities
Assets, net of liabilities	$ 313	$ 188