OTHER FINANCIAL DATA - INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ (106)	$ 98	$ 36	$ 261
Effective income tax rate	95.00%	25.00%	10.00%	26.00%
Deferred Tax Expense From The Outside Basis Difference			$ 32
San Diego Gas and Electric Company [Member]
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ 48	$ 54	$ 120	$ 142
Effective income tax rate	36.00%	29.00%	36.00%	34.00%
Southern California Gas Company [Member]
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
Income tax expense (benefit)	$ (29)	$ 16	$ 58	$ 111
Effective income tax rate	100.00%	18.00%	23.00%	28.00%
Southern California Gas Company [Member] | Pre Tax [Member]
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
General Rate Case, Earnings Charge Due To Income Tax Forecasted Incurred	$ 15		$ 15
Southern California Gas Company [Member] | After Tax [Member]
Income Tax Expense And Effective Income Tax Rates Disclosure [Line Items]
General Rate Case, Earnings Charge Due To Income Tax Forecasted Incurred	$ 9		$ 9