SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - CAPITALIZED FINANCING COSTS (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Capitalized Financing Costs Disclosure [Line Items] | |||
| Total capitalized financing costs | $ 236 | $ 201 | $ 167 |
| San Diego Gas and Electric Company [Member] | |||
| Capitalized Financing Costs Disclosure [Line Items] | |||
| Total capitalized financing costs | 62 | 51 | 52 |
| Southern California Gas Company [Member] | |||
| Capitalized Financing Costs Disclosure [Line Items] | |||
| Total capitalized financing costs | $ 55 | $ 49 | $ 34 |