OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
|
| Capitalized Financing Costs Disclosure [Line Items] | ||||
| AFUDC related to debt | $ 7 | $ 4 | $ 13 | $ 10 |
| AFUDC related to equity | 31 | 24 | 58 | 49 |
| Other capitalized financing costs | 17 | 8 | 34 | 16 |
| Total capitalized financing costs | 55 | 36 | 105 | 75 |
| San Diego Gas and Electric Company [Member] | ||||
| Capitalized Financing Costs Disclosure [Line Items] | ||||
| AFUDC related to debt | 4 | 3 | 7 | 7 |
| AFUDC related to equity | 10 | 7 | 18 | 18 |
| Total capitalized financing costs | 14 | 10 | 25 | 25 |
| Southern California Gas Company [Member] | ||||
| Capitalized Financing Costs Disclosure [Line Items] | ||||
| AFUDC related to debt | 3 | 1 | 6 | 3 |
| AFUDC related to equity | 10 | 6 | 19 | 11 |
| Total capitalized financing costs | $ 13 | $ 7 | $ 25 | $ 14 |