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EMPLOYEE BENEFIT PLANS - SAVINGS PLANS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Savings Plan [Line Items]      
Employer contributions to defined benefit plan $ 43 $ 41 $ 42
Market value of employer stock held by plan 1,000 1,100  
San Diego Gas and Electric Company [Member]      
Savings Plan [Line Items]      
Employer contributions to defined benefit plan 15 14 15
Southern California Gas Company [Member]      
Savings Plan [Line Items]      
Employer contributions to defined benefit plan $ 23 $ 22 $ 22