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%