OTHER FINANCIAL DATA - INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ 15	$ 71	$ 276	$ 291
Effective income tax rate	6.00%	16.00%	22.00%	24.00%
Charge To Reduce Certain Tax Regulatory Assets Attributable To Nuclear Plant				$ 17
Lower Income Tax Expense on Repatriation of Foreign Earnings	$ 14		$ 14
Louisiana Valuation Allowance Release		$ 25		25
Income Tax Reconciliation Prior Year Income Taxes	12		19
Income Tax Reconciliation Other Adjustments	9		22
San Diego Gas and Electric Company [Member]
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ 75	$ 65	$ 217	$ 217
Effective income tax rate	29.00%	28.00%	32.00%	35.00%
Charge To Reduce Certain Tax Regulatory Assets Attributable To Nuclear Plant				$ 17
Income Tax Reconciliation Prior Year Income Taxes			$ 9
Southern California Gas Company [Member]
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ (20)	$ 44	$ 91	$ 110
Effective income tax rate	71.00%	31.00%	25.00%	30.00%
Income Tax Reconciliation Prior Year Income Taxes	$ 11		$ 14