OTHER FINANCIAL DATA - INCOME TAXES (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items] | ||
| Income tax expense (benefit) | $ 142 | $ 163 |
| Effective income tax rate | 31.00% | 27.00% |
| San Diego Gas and Electric Company [Member] | ||
| Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items] | ||
| Income tax expense (benefit) | $ 72 | $ 88 |
| Effective income tax rate | 36.00% | 37.00% |
| Southern California Gas Company [Member] | ||
| Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items] | ||
| Income tax expense (benefit) | $ 87 | $ 95 |
| Effective income tax rate | 31.00% | 31.00% |