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Regulatory Assets and Liabilities - Schedule of Net Regulatory Balancing and Memorandum Accounts (Details) - SCE - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Regulatory Assets and Liabilities    
Assets, net of liabilities $ 1,751 $ 423
Energy procurement related costs    
Regulatory Assets and Liabilities    
Assets, net of liabilities 325 (97)
Public purpose and energy efficiency    
Regulatory Assets and Liabilities    
Assets, net of liabilities (2,189) (1,708)
GRC related balancing accounts    
Regulatory Assets and Liabilities    
Assets, net of liabilities 1,188 976
FERC related balancing accounts    
Regulatory Assets and Liabilities    
Assets, net of liabilities 48 125
Wildfire risk mitigation and insurance    
Regulatory Assets and Liabilities    
Assets, net of liabilities 151 741
TKM Settlement cost recovery    
Regulatory Assets and Liabilities    
Assets, net of liabilities 1,619 0
Wildfire and drought restoration    
Regulatory Assets and Liabilities    
Assets, net of liabilities 291 238
Tax accounting memorandum account    
Regulatory Assets and Liabilities    
Assets, net of liabilities (72) (40)
Other    
Regulatory Assets and Liabilities    
Assets, net of liabilities $ 390 $ 188
Grid Hardening Balancing Account    
Regulatory Assets and Liabilities    
Authorized recovery threshold 110.00%