EMPLOYEE BENEFIT PLANS - SAVINGS PLANS (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Savings Plan [Line Items] | |||
| Employer contributions to defined benefit plan | $ 42 | $ 43 | $ 38 |
| Market value of employer stock held by plan | 1,100 | 1,100 | |
| San Diego Gas and Electric Company [Member] | |||
| Savings Plan [Line Items] | |||
| Employer contributions to defined benefit plan | 15 | 17 | 15 |
| Southern California Gas Company [Member] | |||
| Savings Plan [Line Items] | |||
| Employer contributions to defined benefit plan | $ 22 | $ 21 | $ 18 |