OTHER FINANCIAL DATA - INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ 163	$ 127
Effective income tax rate	27.00%	33.00%
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)	88	83
Effective income tax rate	37.00%	45.00%
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)	$ 95	$ 38
Effective income tax rate	31.00%	33.00%