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REGULATORY MATTERS (Cost Recovery Mechanisms) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2025
Dec. 31, 2019
Over Recovered Purchased Energy Costs        
Regulatory Liabilities [Roll Forward]        
Beginning of Period $ 36 $ (17)   $ (17)
Deferred Fuel and Purchased Power Costs 48 53    
PPFAC Refunds (Recoveries) (48) (58)    
End of Period $ 36 (22)   36
Over Recovered Purchased Energy Costs        
Public Utilities, General Disclosures [Line Items]        
Months approved rate in effect unless modified 12 months      
Renewable Energy Standard        
Regulatory Liabilities [Roll Forward]        
Renewable energy target percentage 10.00%      
Approved spending budget       55
Demand Side Management        
Regulatory Liabilities [Roll Forward]        
Recovery revenue $ 2     2
Energy Efficiency Standards        
Regulatory Liabilities [Roll Forward]        
Approved recovery of spending budget       $ 23
Lost Fixed Cost Recovery        
Regulatory Liabilities [Roll Forward]        
Recovery revenue $ 12 $ 10    
Cap on increase in lost fixed cost recovery rate (percentage) 2.00%      
Scenario, Forecast | Renewable Energy Standard        
Regulatory Liabilities [Roll Forward]        
Renewable energy target percentage     15.00%  
Distributed generation requirement percent of target percentage (percentage)     30.00%