v3.26.3
REGULATORY MATTERS (Cost Recovery Mechanisms) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2024
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2023
Effective 1/1/2024-12/31/2026              
Regulatory Assets [Roll Forward]              
Energy efficiency implementation plan term             3 years
Purchased Power and Fuel Adjustment Clause              
Public Utilities, General Disclosures [Line Items]              
Months approved rate in effect unless modified       12 months      
Regulatory Assets [Roll Forward]              
Beginning of Period   $ (25) $ (49) $ (32) $ (49) $ (49)  
Deferred Fuel and Purchased Power Costs   99 110 235 243    
PPFAC and Base Power Recoveries   (105) (106) (234) (239)    
End of Period   $ (31) $ (45) $ (31) $ (45) $ (32)  
Renewable Energy Standard              
Regulatory Assets [Roll Forward]              
Renewable energy target percentage           15.00%  
Approved spending budget $ 66            
Approved renewable energy standard increase in tariff amount $ 17            
Energy Efficiency Standards | Effective 1/1/2024-12/31/2026              
Regulatory Assets [Roll Forward]              
Approved recovery of spending budget             $ 72
Lost Fixed Cost Recovery              
Regulatory Assets [Roll Forward]              
Cap on increase in lost fixed cost recovery rate (percentage)       2.00%