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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - (Wildfire Fund) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Jul. 12, 2019
Public Utility, Property, Plant and Equipment [Line Items]          
Litigation liability, current $ 193        
Wildfire Fund asset 295   $ 297    
Litigation contribution, net 3,600        
Amortization and accretion 102 $ 76      
Utility          
Public Utility, Property, Plant and Equipment [Line Items]          
Wildfire Fund asset 295   297    
Amortization and accretion 102 $ 76      
Other Current Liabilities          
Public Utility, Property, Plant and Equipment [Line Items]          
Wildfire fund, noncurrent $ 378        
Wildfire Fund Asset          
Public Utility, Property, Plant and Equipment [Line Items]          
Estimated insurance recoveries     134    
Wildfire Recovery Compensation Program          
Public Utility, Property, Plant and Equipment [Line Items]          
Litigation settlement loss     $ 1,100    
Wildfire Fund Asset          
Public Utility, Property, Plant and Equipment [Line Items]          
Finite-lived intangible asset, useful life       20 years 15 years