Regulatory Assets and Liabilities - Schedule of Net Regulatory Balancing and Memorandum Accounts (Details) - SCE - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Regulatory Assets and Liabilities
Assets, net of liabilities	$ 1,976	$ 423
Energy procurement related costs
Regulatory Assets and Liabilities
Assets, net of liabilities	207	(97)
Public purpose and energy efficiency
Regulatory Assets and Liabilities
Assets, net of liabilities	(2,074)	(1,708)
GRC related balancing accounts
Regulatory Assets and Liabilities
Assets, net of liabilities	1,342	976
FERC related balancing accounts
Regulatory Assets and Liabilities
Assets, net of liabilities	107	125
Wildfire risk mitigation and insurance
Regulatory Assets and Liabilities
Assets, net of liabilities	225	741
TKM Settlement cost recovery
Regulatory Assets and Liabilities
Assets, net of liabilities	1,586	0
Wildfire and drought restoration
Regulatory Assets and Liabilities
Assets, net of liabilities	289	238
Tax accounting memorandum account
Regulatory Assets and Liabilities
Assets, net of liabilities	(108)	(40)
Other
Regulatory Assets and Liabilities
Assets, net of liabilities	$ 402	$ 188