Regulatory Assets and Liabilities - Schedule of Net Regulatory Balancing and Memorandum Accounts (Details) - SCE - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Regulatory Assets and Liabilities
Assets, net of liabilities	$ 3,067	$ 3,108
Energy procurement related costs
Regulatory Assets and Liabilities
Assets, net of liabilities	445	589
Public purpose and energy efficiency
Regulatory Assets and Liabilities
Assets, net of liabilities	(2,119)	(2,054)
GRC related balancing accounts
Regulatory Assets and Liabilities
Assets, net of liabilities	2,057	1,945
FERC-related balancing accounts
Regulatory Assets and Liabilities
Assets, net of liabilities	190	204
Wildfire risk mitigation and insurance
Regulatory Assets and Liabilities
Assets, net of liabilities	334	289
Wildfire and drought restoration
Regulatory Assets and Liabilities
Assets, net of liabilities	229	215
Woolsey Settlement cost recovery
Regulatory Assets and Liabilities
Assets, net of liabilities	1,794	1,766
Tax accounting memorandum account
Regulatory Assets and Liabilities
Assets, net of liabilities	(28)	(3)
Other
Regulatory Assets and Liabilities
Assets, net of liabilities	$ 165	$ 157
Grid Hardening Balancing Account
Regulatory Assets and Liabilities
Authorized recovery threshold	110.00%