OTHER FINANCIAL DATA - OTHER INCOME (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Income [Line Items]
Allowance for equity funds used during construction	$ 29	$ 26	$ 86	$ 84
Investment gains (losses)	9	(12)	29	(5)
Losses on interest rate and foreign exchange instruments, net	(11)	(4)	(23)	(7)
Foreign currency transaction losses	(2)	(3)	(9)	(6)
Sale of other investments	1	2	3	8
Electrical infrastructure relocation income	1	0	4	4
Regulatory Interest, net	1	1	4	3
Sundry, net	(2)	2	4	7
Total	26	12	98	88
San Diego Gas and Electric Company [Member]
Other Income [Line Items]
Allowance for equity funds used during construction	11	9	35	27
Regulatory Interest, net	0	1	3	3
Sundry, net	0	(2)	0	(4)
Total	11	8	38	26
Southern California Gas Company [Member]
Other Income [Line Items]
Allowance for equity funds used during construction	10	10	30	29
Regulatory Interest, net	1	0	1	0
Sundry, net	(3)	(2)	(7)	(4)
Total	$ 8	$ 8	$ 24	$ 25