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REGULATORY MATTERS (Cost Recovery Mechanisms) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 06, 2019
Jul. 31, 2018
Jan. 31, 2018
Dec. 31, 2025
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Public Utilities, General Disclosures [Line Items]                
Environmental compliance adjustor, as a percentage of total retail revenue (in percentage)           0.50%    
Environmental compliance adjustor, return on environmental investments           $ 3 $ 1 $ 1
Renewable energy budget spending   $ 55            
Purchased Power and Fuel Adjustment Clause                
Public Utilities, General Disclosures [Line Items]                
Months approved rate in effect unless modified           12 months    
Months of preceding period for true up component           12 months    
Renewable Energy Standard                
Public Utilities, General Disclosures [Line Items]                
Renewable energy target percentage (in percentage)           8.00%    
Approved spending budget     $ 54          
Recovery revenue           $ 1    
Renewable energy actual percentage (in percentage)           14.00%    
Renewable Energy Standard | Scenario, Forecast                
Public Utilities, General Disclosures [Line Items]                
Renewable energy target percentage (in percentage)       15.00%        
Distributed generation requirement target percentage (in percentage)       30.00%        
Energy Efficiency Standards                
Public Utilities, General Disclosures [Line Items]                
Percentage of cumulative annual retail kilowatt savings, actual (in percentage)           16.00%    
Energy Efficiency Standards | Scenario, Forecast                
Public Utilities, General Disclosures [Line Items]                
Percentage of electric energy efficiency standards target retail savings on sales (in percentage)         22.00%      
Demand Side Management - Energy Efficiency Standards                
Public Utilities, General Disclosures [Line Items]                
Recovery revenue           $ 2 2 2
Lost Fixed Cost Recovery Mechanism                
Public Utilities, General Disclosures [Line Items]                
Recovery revenue           $ 26 $ 22 $ 18
Cap on increase in lost fixed cost recovery rate (in percentage)           2.00%    
Subsequent Event | Energy Efficiency Standards                
Public Utilities, General Disclosures [Line Items]                
Approved recovery of spending budget $ 23