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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - (Wildfire Fund) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Jun. 30, 2026
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Jul. 12, 2019
Public Utility, Property, Plant and Equipment [Line Items]                
Litigation liability, current $ 193     $ 193        
Wildfire Fund asset 286     286   $ 297    
Litigation contribution, net 3,400     3,400        
Amortization and accretion 141 $ 86   369 $ 271      
Utility                
Public Utility, Property, Plant and Equipment [Line Items]                
Wildfire Fund asset 286     286   $ 297    
Amortization and accretion 141 $ 86   369 $ 271      
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent                
Public Utility, Property, Plant and Equipment [Line Items]                
Wildfire fund, noncurrent $ 380     $ 380        
Wildfire Fund Asset                
Public Utility, Property, Plant and Equipment [Line Items]                
Estimated insurance recoveries     $ 645          
Wildfire Recovery Compensation Program                
Public Utility, Property, Plant and Equipment [Line Items]                
Litigation settlement loss     $ 1,600          
Wildfire Fund Asset                
Public Utility, Property, Plant and Equipment [Line Items]                
Finite-lived intangible asset, useful life             20 years 15 years