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CALIFORNIA UTILITIES' REGULATORY MATTERS - SCHEDULE OF REGULATORY AMOUNTS 1 (Details) - Year 2016 [Member] - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
San Diego Gas and Electric Company [Member]        
General Rate Case [Line Items]        
General Rate Case, Revenue Requirement, Revised Request $ 1,905      
General Rate Case, Revenue Requirement Increase, Original Request 133      
General Rate Case, Revenue Requirement Increase, Revised Request $ 111     $ 111
General Rate Case, Revenue Requirement Percentage Increase, Revised Request 6.00%      
General Rate Case, Revised Request Decrease Compared To Original $ 6      
General Rate Case, Proposed Revenue Requirement Increase (Decrease)   $ 62 $ 60 $ (84)
General Rate Case, Proposed Revenue Requirement Percentage Increase (Decrease)   3.50% 3.50% (4.70%)
General Rate Case, Adjustment To Decrease Estimated Revenue Requirement 16      
Southern California Gas Company [Member]        
General Rate Case [Line Items]        
General Rate Case, Revenue Requirement, Revised Request 2,342      
General Rate Case, Revenue Requirement Increase, Original Request 256      
General Rate Case, Revenue Requirement Increase, Revised Request $ 246     $ 246
General Rate Case, Revenue Requirement Percentage Increase, Revised Request 12.00%      
General Rate Case, Revised Request Decrease Compared To Original $ 10      
General Rate Case, Proposed Revenue Requirement Increase (Decrease)   $ 78 $ 75 $ 49
General Rate Case, Proposed Revenue Requirement Percentage Increase (Decrease)   3.50% 3.50% 2.30%