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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Wildfire Fund (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Mar. 31, 2024
Jul. 12, 2019
Public Utility, Property, Plant and Equipment [Line Items]              
Litigation liability, current $ 193   $ 193        
Wildfire Fund asset 298   298   $ 301    
Litigation contribution, net 3,800   3,800        
Amortization and accretion 86 $ 139 271 $ 295      
Utility              
Public Utility, Property, Plant and Equipment [Line Items]              
Wildfire Fund asset 298   298   $ 301    
Amortization and accretion 86 $ 139 271 $ 295      
Other Current Liabilities              
Public Utility, Property, Plant and Equipment [Line Items]              
Wildfire fund, noncurrent $ 568   $ 568        
Wildfire Fund Asset              
Public Utility, Property, Plant and Equipment [Line Items]              
Finite-lived intangible asset, useful life           20 years 15 years