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REVENUES - CONTRACT LIABILITIES (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Contract with Customer, Liability [Roll Forward]  
Opening balance, January 1, 2018 $ 0
Adoption of ASC 606 adjustment (68)
Revenue from performance obligations satisfied during reporting period 31
Payments received in advance (39)
Closing balance, December 31, 2018 (76)
Other Current Liabilities [Member]  
Contract with Customer, Liability [Roll Forward]  
Closing balance, December 31, 2018 (6)
Deferred Credits and Other [Member]  
Contract with Customer, Liability [Roll Forward]  
Closing balance, December 31, 2018 (70)
San Diego Gas and Electric Company [Member]  
Contract with Customer, Liability [Roll Forward]  
Closing balance, December 31, 2018 0
Southern California Gas Company [Member]  
Contract with Customer, Liability [Roll Forward]  
Closing balance, December 31, 2018 $ 0