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OTHER FINANCIAL DATA - INCOME TAXES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items] |  |  |  |
Income tax expense (benefit) | $ 98 | $ 93 | $ 261 | $ 220
Effective income tax rate | 25.00% | 25.00% | 26.00% | 29.00%
Charge To Reduce Certain Tax Regulatory Assets Attributable To Nuclear Plant |  |  |  | $ 17
San Diego Gas and Electric Company [Member] |  |  |  |
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items] |  |  |  |
Income tax expense (benefit) | $ 54 | $ 69 | $ 142 | $ 152
Effective income tax rate | 29.00% | 35.00% | 34.00% | 40.00%
Charge To Reduce Certain Tax Regulatory Assets Attributable To Nuclear Plant |  |  |  | $ 17
Southern California Gas Company [Member] |  |  |  |
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items] |  |  |  |
Income tax expense (benefit) | $ 16 | $ 28 | $ 111 | $ 66
Effective income tax rate | 18.00% | 26.00% | 28.00% | 29.00%

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