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GENERAL INFORMATION AND OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Capitalized Financing Costs Disclosure [Line Items]    
Total capitalized financing costs $ 47 $ 49
San Diego Gas and Electric Company [Member]    
Capitalized Financing Costs Disclosure [Line Items]    
Total capitalized financing costs 17 24
Southern California Gas Company [Member]    
Capitalized Financing Costs Disclosure [Line Items]    
Total capitalized financing costs $ 11 $ 13